Population & age
- Total population
- 12,562
- Median age
- 42.5
Frederick County · Washington-Arlington-Alexandria, DC-VA-MD-WV · Population 12,562
Middletown, MD (ZIP 21769) sits in Frederick County within the Washington-Arlington-Alexandria metro area. The page draws on 2 federal data feeds retrieved Apr 27. Top health signal: Health Insurance comes in below the national average at 5.4%. NCES lists 4 schools serving the area, 4 non-charter. 6 colleges and universities serve the area, with median in-state tuition of $26,010. IRS data shows average household income (AGI) of $136,769, well above the ~$45K national average per return. FDIC counts just 2 bank branches in this ZIP (Summary of Deposits, 2024) — residents likely lean on neighboring ZIPs or online banking for most services. Social vulnerability is low in this ZIP at the 7th percentile (CDC SVI), reflecting strong baseline resilience to public-health emergencies and natural disasters. FEMA has issued 23 federal disaster declarations affecting this ZIP since 1971 — a high-frequency exposure profile. Only 5.2% of residents under 65 are uninsured (County Health Rankings, 2025) — well below the national county median. 25.9% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. Maryland levies a graduated state income tax (top rate 5.75%); a household at the local median AGI of $136,769 would pay roughly $4,719/year before deductions. IRS migration data (2022-2023) shows a net gain of 2,387 residents (569 households) — the ZIP's primary county is growing. Healthcare access is the area's quieter strength; school options sit on the lighter side, so families may find themselves looking at districts a few ZIPs over. Notable: median household income $142,887, fair market rent of $1,770 for a two-bedroom, and a typical home value of $568,072, up 1.1% over the past year. Every figure on this page links to its underlying federal dataset with a retrieval date so you can audit the freshness yourself.
Studio
$1,540
/month
1 Bed
$1,590
/month
2 Bed
$1,770
/month
3 Bed
$2,230
/month
4 Bed
$2,630
/month
HUD Fair Market Rents represent the 40th percentile of standard-quality rental housing in this area. FY2026 data.
$568,072
Zillow Home Value Index (ZHVI) · as of March 2026
+1.1%
vs. March 2025
+29.9%
vs. March 2021
Washington-Arlington-Alexandria, DC-VA-MD-WV
Metropolitan statistical area
Source: Zillow Research, ZHVI All Homes (SFR, Condo/Co-op) Time Series (zillow.com/research/data). Zillow Home Value Index (ZHVI) is copyrighted by Zillow, Inc.
New housing units permitted
1,794
Across 1,418 permitted buildings. Total construction value: $498.5M.
Single-family
1,397
78% of total units
Multifamily (2+ unit)
397
22% of total units
Single-family value
$450.8M
construction value
Multifamily value
$47.7M
construction value
Aggregated from 2 counties touching this ZIP (2024).
Source: U.S. Census Bureau Building Permits Survey (census.gov/construction/bps). Public domain. BPS reports annual residential building permits from local permit-issuing jurisdictions, aggregated to county. A permit reflects intent to build, not a completed unit — actual construction lags by 6-24 months for multifamily projects.
Tax returns filed
5,920
Average AGI
$136,769
Avg property tax
$1,154
EITC participation
5.1%
Income distribution
Avg mortgage interest
$2,198
Avg charitable contribution
$1,542
Avg capital gains
$7,757
Avg total income tax
—
Source: IRS Statistics of Income — Individual Income Tax Statistics by ZIP Code (irs.gov). Public domain. Dollar columns reported in thousands by the IRS; figures here display real dollars. Total ZCTA AGI for the area was $809.7M across all reported brackets.
Business establishments
214
Total employment
1,581
Annual payroll
$75.4M
Average annual pay
$47,672
Source: U.S. Census Bureau, ZIP Business Patterns (census.gov). Public domain. ZBP covers establishments with paid employees; Census suppresses employment and payroll values when fewer employers operate in a ZIP than would protect their confidentiality.
Average annual pay
$69,852
Average weekly wage
$1,343
Total employment
108,438
Total establishments
7,170
That is roughly 7% above the US national average of $65,470 per worker.
Source: U.S. Bureau of Labor Statistics, Quarterly Census of Employment and Wages (bls.gov/cew). Public domain. QCEW is derived from state unemployment-insurance filings and covers ~95% of US jobs. Figures are county-level totals assigned to ZIPs whose primary county matches; small-employer cells are suppressed by BLS to protect employer confidentiality.
Unemployment rate
2.6%
That is 1.4 percentage points below the US national unemployment rate of about 4.0%.
Labor force
158,631
Employed
154,529
Unemployed
4,102
Based on Frederick County, MD data (2024).
Source: U.S. Bureau of Labor Statistics, Local Area Unemployment Statistics (bls.gov/lau). Public domain. LAUS publishes monthly and annual labor-force estimates for every US county. Figures are county-level totals assigned to ZIPs whose primary county matches.
FDIC-insured bank branches
2
Limited banking access
Only a handful of branches — residents may rely on neighboring ZIPs or online banking for most services.
Total deposits
$334.8M
across all branches in this ZIP
Distinct institutions
2
different banks operating here
Top banks by deposits in this ZIP
Based on FDIC-insured branch offices as of June 30, 2024.
Source: FDIC Summary of Deposits (fdic.gov). Annual June-30 snapshot of every FDIC-insured branch and the deposits booked there. Figures cover all institutions reporting a branch address in this ZIP.
FTA tracks transit service at the urbanized-area level. Numbers below reflect the agencies and modes serving the area that contains this ZIP, not stop-level coverage.
Service status
Available
Frederick, MD
Reporting agencies
4
Largest: Eastern Panhandle Transit Authority
Annual ridership
—
unlinked trips · 2024
Source: U.S. Federal Transit Administration, National Transit Database (transit.dot.gov). Public domain.
Public EV charging stations
3
Established EV charging
Multiple public charging stations across the ZIP — typical of mid-density suburban and small-urban areas with active EV adoption.
Level 2 ports
4
AC charging — workplace, retail, home
DC Fast ports
0
Highway-class fast charging
Charging networks
Active public stations only. Snapshot taken 2026; AFDC's underlying registry refreshes continuously as stations open and close.
Source: U.S. Department of Energy via NREL (afdc.energy.gov). Per-ZIP counts of active public alternative-fuel stations (electric, hydrogen, propane, CNG, biodiesel, E85, LNG, renewable diesel) and EV charging-port totals.
Public-library outlets
1
Single library outlet
One public-library outlet serves this ZIP — typical of suburban and small-town areas. Card holders also have full access to the rest of the system's branches.
Buildings
1
1 branch
Avg hours / week
51.7
across outlets in this ZIP
Avg square feet
2,500
per outlet
Outlets in this ZIP
Public libraries provide free WiFi, computer access, children's programming, job-seeking resources, and meeting space — community infrastructure beyond books. FY2023 outlet inventory from the federal Public Libraries Survey.
Source: Institute of Museum and Library Services (imls.gov). Per-ZIP counts of active public-library outlets — central buildings, branches, and bookmobiles — operated by federally reporting library systems.
Federally Declared Disasters
23
Date Range
1971–2026
Most Recent Declaration
SEVERE WINTER STORM
Winter Storm — declared January 24, 2026 (DR-3634)
Incident period: January 23, 2026 – January 27, 2026
Top Incident Types
Individual Assistance
8
Direct help to disaster survivors
Households Program
2
Housing & temporary lodging support
Public Assistance
22
Repair of public facilities & roads
Hazard Mitigation
7
Funding to reduce future disaster risk
FEMA declares disasters at the county level; counts here include every federally declared disaster touching any county that overlaps this ZIP. Statewide declarations and pre-1964 records without county granularity are excluded. Program flags reflect which FEMA assistance categories were activated (Individual Assistance, Households, Public Assistance, Hazard Mitigation). Source: fema.gov/openfema. Public domain.
30-year averages (1991-2020) from the nearest GHCN-D weather station. Temperature and precipitation values reflect typical annual conditions, not any single year.
Avg. temperature
54°F
45.1° – 62.8°
Annual precipitation
47.9"
Annual snowfall
31.4"
Heating · cooling days
4,977.1 · 990.5
Annual base 65°F
Nearest station: DAMASCUS 3 SSW, MD US, 21.8 miles from the centroid of Middletown, MD (ZIP 21769)
Source: NOAA National Centers for Environmental Information, 1991–2020 U.S. Climate Normals (ncei.noaa.gov). Public domain.
Median daily AQI
43
GoodPeak AQI (2024)
100
Moderate
Primary pollutant
Ozone
243 days as main pollutant
Days measured
243
Based on Frederick County data (2024).
Source: U.S. Environmental Protection Agency, Air Quality System (epa.gov). Public domain. Only counties with EPA AQS monitoring stations appear here (~30% of US counties); rural ZIPs whose primary county has no monitor will not show this section.
Years of potential life lost (per 100K)
5,697
That is roughly 2,503 years per 100,000 below the national county median (~8,200).
Premature death is the headline composite outcome CHR reports — age-adjusted, all-cause, before age 75.
Fair or poor health
15%
of adults self-report
Poor physical health days
3.7
avg per adult per month
Poor mental health days
5.0
avg per adult per month
Uninsured
5.2%
of residents under 65
Primary care MDs
56
per 100,000 residents
Preventable hospital stays
2,107
per 100K Medicare enrollees
Food environment (0-10)
8.7
10 = best access & security
Exercise access
90%
residents near a facility
Flu vaccinated
54%
of Medicare enrollees
Low birth weight (under 2,500 g) accounts for 6.8% of live births in this county — an early-life health input that downstream outcomes track against.
Based on Frederick data (2025 CHR release).
Source: County Health Rankings & Roadmaps, University of Wisconsin Population Health Institute (countyhealthrankings.org). Annual release. Underlying source datasets vary by measure (CDC BRFSS, NCHS Vital Statistics, AHA, USDA Food Environment Atlas, and others). Figures are county-level and assigned to every ZIP whose primary county matches.
Food access status
Significant food access concerns
25.9% of Frederick County, MD residents live more than 1 mile (urban) or 10 miles (rural) from the nearest supermarket.
Grocery stores
0.14
per 1,000 residents
Supercenters & clubs
0.02
per 1,000 residents
SNAP-authorized stores
0.50
accepting food benefits
Fast-food restaurants
0.77
per 1,000 residents
Among low-income residents, 3.1% are low-access — those without a supermarket within 1 mile (urban) or 10 miles (rural).
Per-1,000 figures show how many of each store type exist in Frederick County, MD for every 1,000 residents. Higher grocery and supercenter density usually means easier access to fresh food; higher convenience-store-only density (with low grocery rate) often signals a food swamp.
Source: USDA Economic Research Service, Food Environment Atlas (ers.usda.gov). County-level metrics fanned to ZIP via the primary county in the Census ZCTA-county relationship file. Variable years differ per family (stores ~2020, low-access ~2019).
FBI publishes crime data at the county level. Numbers below cover the primary county that contains this ZIP. Rates are per 100,000 residents in the area covered by reporting agencies.
Violent crime rate
—
per 100K residents · 184 reports
Property crime rate
—
per 100K residents · 1,029 reports
Homicide
4
Robbery
12
Burglary
106
Vehicle theft
79
County-level data for Frederick (2024)
Source: U.S. Federal Bureau of Investigation, Uniform Crime Reporting Program (cde.ucr.cjis.gov). Public domain. Coverage varies by reporting agency; areas with partial agency coverage may understate true crime totals.
Net migration (2022-2023)
▲+2,387 people
+569 households • +$137.5M net AGI flow
Moved in
10,984households
19,795 people • $992.3M AGI
Moved out
10,415households
17,408 people • $854.8M AGI
Where new residents came from
Where departing residents went
Incoming households reported an average AGI of $90,337 versus departing households' $82,073.
Source: U.S. Internal Revenue Service, Statistics of Income, Migration Data (irs.gov). Public domain. Migration is measured by year-over-year changes in the address on individual tax returns; figures are county-level totals attributed to ZIPs whose primary county matches. Foreign migration contributes to inflow/outflow totals but does not appear in the top-county lists. Small flows are suppressed by IRS to protect taxpayer confidentiality.
State-level rules that apply to every resident of ZIP 21769. Numbers reflect the most recent published year per source.
Income tax
5.75%
graduated · 7 brackets
Sales tax (combined)
6.00%
State 6.00% · avg local 0.00%
Property tax (effective)
1.48%
Median $3,236/year
Tax burden rank
43 of 50
11.90% of personal income
For ZIP 21769: At this ZIP's median AGI of $136,769, the estimated state income tax (before deductions) runs about $4,719 per year. Applied to this ZIP's typical home value of $568,072, that works out to roughly $8,382/year in property tax.
Program
Family and Medical Leave Insurance
Mandatory (state-run insurance) · benefits begin 2027/2028
Max weeks/year
24
Parental
12wk
Max weekly benefit
$1,000
Replacement: 90% AWW up to 0.65x SAWW + 50% above · job protection
SNAP eligibility
200% FPL
Broad-Based Categorical Eligibility (raises gross income limit above federal 130% floor). No asset test.
Sources: Tax Foundation (state tax rates & brackets), Bipartisan Policy Center (paid family leave), USDA FNS (SNAP categorical eligibility).
Nearby ZIPs by distance
21714 (Braddock Heights, 3.8 mi) · 21718 (Burkittsville, 4.6 mi) · 21779 (Gapland, 4.7 mi) · 21755 (Jefferson, 5.7 mi) · 21715 (Brownsville, 6.6 mi) · 21756 (Keedysville, 6.8 mi)
Compare ZIP-level stats — population, schools, housing, climate — across nearby areas. Source: U.S. Census Bureau ZCTA basemap.
All data on this page is sourced from federal government datasets · Not AI-generated · Methodology
Crude prevalence estimates from CDC PLACES, derived from BRFSS small-area modeling. Population-level figures only.
33.1%
Tracks close to the 33.0% national rate.
34.5%
2.5pp above the 32.0% national rate.
21.2%
Tracks close to the 22.0% national rate.
79.9%
3.9pp above the 76.0% national rate.
5.4%
7.6pp below the 13.0% national rate.
10.0%
Tracks close to the 11.0% national rate.
4 schools serve this ZIP, including 4 non-charter.
| School | Type | Grades | Enrollment |
|---|---|---|---|
| Middletown High | Public | 9–12 | 1,149 |
| Middletown Middle | Public | 6–8 | 794 |
| Middletown Primary | Public | -1–2 | 428 |
| Middletown Elementary | Public | 3–5 | 417 |
Schools listed from NCES Common Core of Data via the Urban Institute Education Data Portal.
Fresh.NCES CCD via Urban Institute EDP · Apr 27, 2026Colleges in this area
6
Median in-state tuition
$26,010
Median earnings (10 yr)
$44,032
Frederick, MD · 21702
Hagerstown, MD · 21742
Emmitsburg, MD · 21727
Frederick, MD · 21701
Frederick, MD · 21701
Hagerstown, MD · 21740
Source: U.S. Department of Education College Scorecard (collegescorecard.ed.gov). Public domain data. Earnings figures reflect median earnings 10 years after entry for federally-aided students.
Middletown, MD (ZIP 21769) sits in Frederick County within the Washington-Arlington-Alexandria metro area. The page draws on 2 federal data feeds retrieved Apr 27. Top health signal: Health Insurance comes in below the national average at 5.4%. NCES lists 4 schools serving the area, 4 non-charter. 6 colleges and universities serve the area, with median in-state tuition of $26,010. IRS data shows average household income (AGI) of $136,769, well above the ~$45K national average per return. FDIC counts just 2 bank branches in this ZIP (Summary of Deposits, 2024) — residents likely lean on neighboring ZIPs or online banking for most services. Social vulnerability is low in this ZIP at the 7th percentile (CDC SVI), reflecting strong baseline resilience to public-health emergencies and natural disasters. FEMA has issued 23 federal disaster declarations affecting this ZIP since 1971 — a high-frequency exposure profile. Only 5.2% of residents under 65 are uninsured (County Health Rankings, 2025) — well below the national county median. 25.9% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. Maryland levies a graduated state income tax (top rate 5.75%); a household at the local median AGI of $136,769 would pay roughly $4,719/year before deductions. IRS migration data (2022-2023) shows a net gain of 2,387 residents (569 households) — the ZIP's primary county is growing. Healthcare access is the area's quieter strength; school options sit on the lighter side, so families may find themselves looking at districts a few ZIPs over. Notable: median household income $142,887, fair market rent of $1,770 for a two-bedroom, and a typical home value of $568,072, up 1.1% over the past year. Every figure on this page links to its underlying federal dataset with a retrieval date so you can audit the freshness yourself.
The two domains pull in different directions. Healthcare access reads strong, but the on-paper school count is on the lighter side — that’s less a quality signal and more a density one. Households here often look at districts a few ZIPs over for school choice while keeping their providers local.
One concrete reading worth keeping: Depression prevalence sits near the national rate at 21.2%. Each figure on this page links to the original federal dataset with its retrieval date — this synthesis is a reading, not a substitute for the underlying records.
33.1%, which is 0.1 percentage points above the national average of 33.0% (CDC PLACES, retrieved Apr 24, 2026).
21.2%, which is 0.8 percentage points below the national average of 22.0% (CDC PLACES, retrieved Apr 24, 2026).
34.5%, which is 2.5 percentage points above the national average of 32.0% (CDC PLACES, retrieved Apr 24, 2026).
4 schools serve this ZIP, including 4 public schools (NCES CCD, retrieved Apr 27, 2026). No charter schools are listed in this ZIP by NCES CCD.
No charter schools are listed in ZIP 21769 by NCES CCD (retrieved Apr 27, 2026).
Yes, 1 high school serves this ZIP: Middletown High. (NCES CCD, retrieved Apr 27, 2026).
12,562 people live in ZIP 21769, with a median age of 42.5 (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
$142,887 per year (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
In ZIP 21769, 88.0% of occupied housing units are owner-occupied and 12.0% are renter-occupied (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
In ZIP 21769, 20.6% of workers work from home. Public transit is used by 0.7% of commuters (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
2.1% of the population in ZIP 21769 lives below the federal poverty line (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
95.3% of households in ZIP 21769 have broadband internet access (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
The typical home value in ZIP 21769 is $568,072, up 1.1% from a year ago (Zillow Home Value Index, retrieved May 1, 2026).
Home values are up 1.1% over the past year and up 29.9% over the past five years (Zillow Home Value Index, retrieved May 1, 2026).
The average Adjusted Gross Income reported on tax returns from ZIP 21769 (Middletown, MD) is $136,769 per return (IRS SOI Tax Year 2022, retrieved May 2, 2026).
Tax returns from ZIP 21769 report an average of $1,154 per return in real-estate tax deductions (IRS SOI Tax Year 2022, retrieved May 2, 2026).
16.7% of tax returns from ZIP 21769 (Middletown, MD) report Adjusted Gross Income of $200,000 or more (IRS SOI Tax Year 2022, retrieved May 2, 2026).
As of 2022, 214 business establishments operated in ZIP 21769 employing 1,581 workers (Census ZIP Business Patterns, retrieved May 3, 2026).
The average annual pay across all local establishments in ZIP 21769 is $47,672, based on Census ZIP Business Patterns 2022 data (retrieved May 3, 2026).
According to the CDC Social Vulnerability Index (2022), ZIP 21769 ranks in the 7th percentile nationally for social vulnerability — a low vulnerability profile (retrieved May 3, 2026).
Racial & Ethnic Minority Status is the highest-scoring CDC SVI theme for ZIP 21769, ranking in the 28th percentile nationally (CDC/ATSDR Social Vulnerability Index 2022, retrieved May 3, 2026).
FEMA has recorded 23 federal disaster declarations affecting ZIP 21769 between 1971–2026 (FEMA OpenFEMA Disaster Declarations, retrieved May 3, 2026).
Hurricane is the most common federally declared disaster type affecting ZIP 21769, accounting for 6 of 23 declarations (26%, FEMA OpenFEMA, retrieved May 3, 2026).
The most recent FEMA disaster declaration affecting ZIP 21769 was "SEVERE WINTER STORM" — a winter storm declared in 2026 (DR-3634) (FEMA OpenFEMA, retrieved May 3, 2026).
6 colleges and universities are listed near ZIP 21769 by the U.S. Department of Education College Scorecard, including Frederick Community College, Hagerstown Community College, and Mount St. Mary'S University (retrieved May 2, 2026).
Median in-state tuition across 6 nearby institutions is $26,010 (College Scorecard, retrieved May 2, 2026).
Graduates of nearby colleges earn a median of $44,032 ten years after entry (College Scorecard, retrieved May 2, 2026).
ZIP 21769 has an average annual temperature of 54.0°F and 47.9" of annual precipitation based on the DAMASCUS 3 SSW, MD US weather station 21.8 miles from the ZIP centroid (NOAA 1991–2020 Climate Normals, retrieved May 8, 2026).
Yes — ZIP 21769 is part of the Frederick, MD urbanized area, primarily served by Eastern Panhandle Transit Authority (National Transit Database 2024, retrieved May 4, 2026).
Maryland has a graduated income tax with a top rate of 5.75%. Households at the local median AGI of $136,769 would pay roughly $4,719 in state income tax annually (estimated, before deductions). Combined sales tax: 6.00% (Tax Foundation 2025).
Maryland has enacted a paid family leave program with benefits beginning 2027/2028 but it is not yet active (Bipartisan Policy Center 2026).
This page covers health outcomes from CDC PLACES (40 metrics), school information from NCES CCD (4 schools), demographics from the Census ACS 5-Year (2022), home values from the Zillow Home Value Index, colleges from the U.S. Department of Education College Scorecard (6 institutions), income & tax statistics from the IRS SOI (Tax Year 2022), local business & employment from Census ZIP Business Patterns (2022), social vulnerability scores from the CDC/ATSDR SVI (2022), federal disaster declarations from FEMA OpenFEMA (23 on record), climate normals from NOAA NCEI (1991-2020), county-level crime data from the FBI Crime Data Explorer (2024), public transit coverage from the National Transit Database (2024), and state-level tax rates from the Tax Foundation. Data is refreshed on Mubboo's standard schedule.
Health data retrieved Apr 24, 2026 from CDC PLACES. School data retrieved Apr 27, 2026 from NCES CCD. Demographics retrieved Apr 30, 2026 from Census ACS 5-Year (2022). Home values retrieved May 1, 2026 from Zillow Research. College data retrieved May 2, 2026 from U.S. Dept of Education College Scorecard. Income & tax statistics retrieved May 2, 2026 from IRS SOI (Tax Year 2022). Business & employment retrieved May 3, 2026 from Census ZBP (2022). Social vulnerability scores retrieved May 3, 2026 from CDC/ATSDR SVI (2022). Federal disaster declarations retrieved May 3, 2026 from FEMA OpenFEMA (23 on record). Climate normals retrieved May 8, 2026 from NOAA NCEI (1991-2020). County-level crime data retrieved May 4, 2026 from the FBI Crime Data Explorer (2024). Transit coverage retrieved May 4, 2026 from the National Transit Database (2024). State-level tax rates retrieved 2026-05-05 15:58:22.284+00 from the Tax Foundation.
Nearby ZIPs by distance
21714 (Braddock Heights, 3.8 mi) · 21718 (Burkittsville, 4.6 mi) · 21779 (Gapland, 4.7 mi) · 21755 (Jefferson, 5.7 mi) · 21715 (Brownsville, 6.6 mi) · 21756 (Keedysville, 6.8 mi)
Compare ZIP-level stats — population, schools, housing, climate — across nearby areas. Source: U.S. Census Bureau ZCTA basemap.
Have a specific question about ZIP 21769?
Ask Mubboo — launching Q4 2026.
Data refreshed via Mubboo's ETL pipeline; oldest source on this page retrieved Apr 24, 2026.
Social Vulnerability Index
Overall SVI
7th percentile
Low Vulnerability
Based on 7 census tracts, population 13,172
Vulnerability Themes
Households Without Vehicle
86
Limited English Speakers
30
Persons with Disability
1,165
Without HS Diploma
357
Without Health Insurance
575
Adults Age 65+
2,421
The Social Vulnerability Index uses U.S. Census data to identify communities most at risk during public health emergencies and natural disasters. Higher percentiles indicate greater vulnerability. Tract-level scores are aggregated to this ZCTA via Census 2020 ZCTA→Tract crosswalk, weighted by land-area share. Source: atsdr.cdc.gov. Public domain.