Population & age
- Total population
- 294
- Median age
- 51.4
Concord, IL (62631)
Morgan County · Population 294
Fresh.Data current as of Apr 24, 2026
Concord, IL (ZIP 62631) sits in Morgan County. The page draws on 2 federal data feeds retrieved Apr 27. Top health signal: Obesity comes in above the national average at 40.4%. NCES lists 2 schools serving the area, 2 non-charter. 2 colleges and universities serve the area, with median in-state tuition of $33,413. IRS data shows average household income (AGI) of $80,947, well above the ~$45K national average per return. Local establishments report average pay of $25,444 per worker (Census ZBP) — below the US average. The CDC SVI flags household composition (67th percentile) as this ZIP's standout vulnerability dimension, sitting well above its overall 27th-percentile score. FEMA has issued 17 federal disaster declarations affecting this ZIP since 1973. Only 6.0% of residents under 65 are uninsured (County Health Rankings, 2025) — well below the national county median. 38.5% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. IRS migration data (2022-2023) shows a net loss of 223 residents (130 households) — the ZIP's primary county is shrinking. 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 $58,047, fair market rent of $1,050 for a two-bedroom, and a typical home value of $111,817, down 8.3% 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.
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Demographics
Race & ethnicity
- White
- 98.3%
- Black
- 0.0%
- Asian
- 0.0%
- Hispanic / Latino
- 1.7%
- Other / multi-racial
- 1.7%
Income & housing
- Median household income
- $58,047
- Median home value
- $113,100
Education
- Bachelor's degree or higher (age 25+)
- 4.0%
Employment
- Unemployment rate
- 0.9%
Housing
- Owner-occupied
- 120(87.6%)
- Renter-occupied
- 17(12.4%)
- Vacant units
- 30
- Built (median)
- 1938
Commute
- Public transit
- 0(0.0%)
- Work from home
- 8(7.6%)
- Avg commute
- 27.1 min
Economic wellbeing
- Below poverty line
- 40(13.6%)
- Uninsured
- 0(0.0%)
Digital access
- Broadband access
- 81(59.1%)
- No broadband
- 56(40.9%)
Language & nativity
- Foreign-born
- 0(0.0%)
- Non-English at home
- 2(0.7%)
Fair Market Rent
Fresh.HUD SAFMR · May 1, 2026Studio
$720
/month
1 Bed
$870
/month
2 Bed
$1,050
/month
3 Bed
$1,370
/month
4 Bed
$1,760
/month
HUD Fair Market Rents represent the 40th percentile of standard-quality rental housing in this area. FY2026 data.
Home values
Typical home value
$111,817
Zillow Home Value Index (ZHVI) · as of March 2026
Year-over-year change
-8.3%
vs. March 2025
Metro area
Jacksonville, IL
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 construction
New housing units permitted
8
Across 6 permitted buildings. Total construction value: $1.5M.
Single-family
4
50% of total units
Multifamily (2+ unit)
4
50% of total units
Single-family value
$772,000
construction value
Multifamily value
$720,000
construction value
Based on county-level data (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.
Income & tax statistics
Tax returns filed
150
Average AGI
$80,947
Avg property tax
—
EITC participation
—
Income distribution
- $1 – $25,00026.7% · 40
- $25,000 – $50,00013.3% · 20
- $50,000 – $75,00026.7% · 40
- $75,000 – $100,0000.0% · 0
- $100,000 – $200,00033.3% · 50
- $200,000 or more0.0% · 0
Avg mortgage interest
—
Avg charitable contribution
—
Avg capital gains
$1,707
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 $12.1M across all reported brackets.
Business & employment
Business establishments
3
Total employment
9
Annual payroll
$229K
Average annual pay
$25,444
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.
Employment & wages
Average annual pay
$53,188
Average weekly wage
$1,023
Total employment
13,936
Total establishments
714
That is roughly 19% below 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
Unemployment rate
4.3%
That is 0.3 percentage points above the US national unemployment rate of about 4.0%.
Labor force
14,863
Employed
14,231
Unemployed
632
Based on Morgan County, IL 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.
Federal Disaster Declarations
Federally Declared Disasters
17
Date Range
1973–2023
Most Recent Declaration
SEVERE STORMS AND FLOODING
Severe Storm — declared August 15, 2023 (DR-4728)
Incident period: June 29, 2023 – July 2, 2023
Top Incident Types
- Flood6 (35%)
- Severe Storm4 (24%)
- Tornado2 (12%)
- Biological2 (12%)
- Snowstorm2 (12%)
- Other1 (6%)
Individual Assistance
8
Direct help to disaster survivors
Households Program
2
Housing & temporary lodging support
Public Assistance
16
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.
Climate
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
52.7°F
41.6° – 63.8°
Annual precipitation
39.3"
Annual snowfall
16.2"
Heating · cooling days
5,509.5 · 1,067.5
Annual base 65°F
Nearest station: JACKSONVILLE 2E, IL US, 10.5 miles from the centroid of Concord, IL (ZIP 62631)
Source: NOAA National Centers for Environmental Information, 1991–2020 U.S. Climate Normals (ncei.noaa.gov). Public domain.
Community health profile
Years of potential life lost (per 100K)
8,190
That tracks the national county median of about 8,200 years per 100,000.
Premature death is the headline composite outcome CHR reports — age-adjusted, all-cause, before age 75.
Fair or poor health
18%
of adults self-report
Poor physical health days
4.5
avg per adult per month
Poor mental health days
5.5
avg per adult per month
Uninsured
6.0%
of residents under 65
Primary care MDs
46
per 100,000 residents
Preventable hospital stays
2,768
per 100K Medicare enrollees
Food environment (0-10)
7.2
10 = best access & security
Exercise access
73%
residents near a facility
Flu vaccinated
45%
of Medicare enrollees
Low birth weight (under 2,500 g) accounts for 10.5% of live births in this county — an early-life health input that downstream outcomes track against.
Based on Morgan 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
Food access status
Significant food access concerns
38.5% of Morgan County, IL residents live more than 1 mile (urban) or 10 miles (rural) from the nearest supermarket.
Grocery stores
0.09
per 1,000 residents
Supercenters & clubs
—
per 1,000 residents
SNAP-authorized stores
1.16
accepting food benefits
Fast-food restaurants
0.75
per 1,000 residents
Among low-income residents, 13.4% 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 Morgan County, IL 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).
Safety
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 · 2 reports
Property crime rate
—
per 100K residents · 19 reports
Homicide
0
Robbery
0
Burglary
10
Vehicle theft
2
County-level data for Morgan (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.
Who’s moving in and out
Net migration (2022-2023)
▼−223 people
−130 households • −$12.3M net AGI flow
Moved in
821households
1,371 people • $37.0M AGI
Moved out
951households
1,594 people • $49.3M AGI
Where new residents came from
- Sangamon County, IL — 118 households
- Cass County, IL — 49 households
- Scott County, IL — 37 households
- Greene County, IL — 35 households
- Macoupin County, IL — 27 households
Where departing residents went
- Sangamon County, IL — 158 households
- Greene County, IL — 43 households
- Scott County, IL — 41 households
- Cass County, IL — 35 households
- Cook County, IL — 20 households
Incoming households reported an average AGI of $45,067 versus departing households' $51,805.
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.
Taxes & benefits in Illinois
State-level rules that apply to every resident of ZIP 62631. Numbers reflect the most recent published year per source.
Tax rates
Income tax
Yes
graduated
Sales tax (combined)
8.96%
State 6.25% · avg local 2.71%
Property tax (effective)
2.18%
Median $4,224/year
Tax burden rank
38 of 50
11.20% of personal income
For ZIP 62631: Applied to this ZIP's typical home value of $111,817, that works out to roughly $2,437/year in property tax.
Paid family leave
Program
No program
No program
Safety net
SNAP eligibility
165% 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).
Other ZIPs near 62631
Nearby ZIPs by distance
62628 (Chapin, 4.2 mi) · 62611 (Arenzville, 4.6 mi) · 62665 (Meredosia, 9.3 mi) · 62650 (Jacksonville, 9.4 mi) · 62622 (10.4 mi) · 62691 (Virginia, 11.2 mi)
Compare ZIP-level stats — population, schools, housing, climate — across nearby areas. Source: U.S. Census Bureau ZCTA basemap.
Data sources used on this page
SourcesFresh.CDC PLACES · Apr 24, 2026Fresh.NCES CCD via Urban Institute EDP · Apr 27, 2026Fresh.HUD SAFMR · May 1, 2026
All data on this page is sourced from federal government datasets · Not AI-generated · Methodology
Health profile
Crude prevalence estimates from CDC PLACES, derived from BRFSS small-area modeling. Population-level figures only.
Obesity
40.4%
7.4pp above the 33.0% national rate.
High Blood Pressure
37.7%
5.7pp above the 32.0% national rate.
Depression
24.4%
2.4pp above the 22.0% national rate.
Annual Checkup
78.2%
2.2pp above the 76.0% national rate.
Health Insurance
8.3%
4.7pp below the 13.0% national rate.
Diabetes
12.4%
Tracks close to the 11.0% national rate.
Schools in this ZIP
2 schools serve this ZIP, including 2 non-charter.
| School | Type | Grades | Enrollment |
|---|---|---|---|
| Triopia Grade School | Public | -1–6 | 195 |
| Triopia Jr-Sr High School | Public | 7–12 | 193 |
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 & universities nearby
Colleges in this area
2
Median in-state tuition
$33,413
Median earnings (10 yr)
$49,689
- 4-Year
Illinois College
Jacksonville, IL · 62650
- In-state tuition
- $38,676
- Out-of-state tuition
- $38,676
- Acceptance rate
- 78.2%
- Graduation rate
- 62.5%
- Median earnings (10 yr)
- $52,575
- Median student debt
- $25,565
- 4-Year
Blackburn College
Carlinville, IL · 62626
- In-state tuition
- $28,149
- Out-of-state tuition
- $28,149
- Acceptance rate
- 63.2%
- Graduation rate
- 55.1%
- Median earnings (10 yr)
- $46,802
- Median student debt
- $24,242
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.
What these numbers say together
Concord, IL (ZIP 62631) sits in Morgan County. The page draws on 2 federal data feeds retrieved Apr 27. Top health signal: Obesity comes in above the national average at 40.4%. NCES lists 2 schools serving the area, 2 non-charter. 2 colleges and universities serve the area, with median in-state tuition of $33,413. IRS data shows average household income (AGI) of $80,947, well above the ~$45K national average per return. Local establishments report average pay of $25,444 per worker (Census ZBP) — below the US average. The CDC SVI flags household composition (67th percentile) as this ZIP's standout vulnerability dimension, sitting well above its overall 27th-percentile score. FEMA has issued 17 federal disaster declarations affecting this ZIP since 1973. Only 6.0% of residents under 65 are uninsured (County Health Rankings, 2025) — well below the national county median. 38.5% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. IRS migration data (2022-2023) shows a net loss of 223 residents (130 households) — the ZIP's primary county is shrinking. 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 $58,047, fair market rent of $1,050 for a two-bedroom, and a typical home value of $111,817, down 8.3% 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 higher the national rate at 24.4%. 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.
Frequently Asked Questions — ZIP 62631
What is the obesity rate in ZIP 62631?
40.4%, which is 7.4 percentage points above the national average of 33.0% (CDC PLACES, retrieved Apr 24, 2026).
What is the depression rate in ZIP 62631?
24.4%, which is 2.4 percentage points above the national average of 22.0% (CDC PLACES, retrieved Apr 24, 2026).
What is the high blood pressure rate in ZIP 62631?
37.7%, which is 5.7 percentage points above the national average of 32.0% (CDC PLACES, retrieved Apr 24, 2026).
How many schools are in ZIP 62631?
2 schools serve this ZIP, including 2 public schools (NCES CCD, retrieved Apr 27, 2026). No charter schools are listed in this ZIP by NCES CCD.
Does ZIP 62631 have charter schools?
No charter schools are listed in ZIP 62631 by NCES CCD (retrieved Apr 27, 2026).
Are there high schools in ZIP 62631?
Yes, 1 high school serves this ZIP: Triopia Jr-Sr High School. (NCES CCD, retrieved Apr 27, 2026).
What is the population of ZIP 62631?
294 people live in ZIP 62631, with a median age of 51.4 (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
What is the median household income in ZIP 62631?
$58,047 per year (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
Is ZIP 62631 mostly renters or homeowners?
In ZIP 62631, 87.6% of occupied housing units are owner-occupied and 12.4% are renter-occupied (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
How do people commute in ZIP 62631?
In ZIP 62631, 7.6% of workers work from home. Public transit is used by 0.0% of commuters (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
What is the poverty rate in ZIP 62631?
13.6% of the population in ZIP 62631 lives below the federal poverty line (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
What percentage of households in ZIP 62631 have broadband internet?
59.1% of households in ZIP 62631 have broadband internet access (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
What is the typical home value in ZIP 62631?
The typical home value in ZIP 62631 is $111,817, down 8.3% from a year ago (Zillow Home Value Index, retrieved May 1, 2026).
Are home values rising or falling in ZIP 62631?
Home values are down 8.3% over the past year (Zillow Home Value Index, retrieved May 1, 2026).
What is the average household income in ZIP 62631?
The average Adjusted Gross Income reported on tax returns from ZIP 62631 (Concord, IL) is $80,947 per return (IRS SOI Tax Year 2022, retrieved May 2, 2026).
How much do homeowners pay in property tax in ZIP 62631?
Tax returns from ZIP 62631 report an average of $0 per return in real-estate tax deductions (IRS SOI Tax Year 2022, retrieved May 2, 2026).
What percentage of residents in ZIP 62631 earn over $200,000?
0.0% of tax returns from ZIP 62631 (Concord, IL) report Adjusted Gross Income of $200,000 or more (IRS SOI Tax Year 2022, retrieved May 2, 2026).
How many businesses are in ZIP 62631?
As of 2022, 3 business establishments operated in ZIP 62631 employing 9 workers (Census ZIP Business Patterns, retrieved May 3, 2026).
What is the average salary in ZIP 62631?
The average annual pay across all local establishments in ZIP 62631 is $25,444, based on Census ZIP Business Patterns 2022 data (retrieved May 3, 2026).
How vulnerable is ZIP 62631 to disasters and public health emergencies?
According to the CDC Social Vulnerability Index (2022), ZIP 62631 ranks in the 27th percentile nationally for social vulnerability — a moderate vulnerability profile (retrieved May 3, 2026).
What is the biggest vulnerability factor in ZIP 62631?
Household Characteristics is the highest-scoring CDC SVI theme for ZIP 62631, ranking in the 67th percentile nationally (CDC/ATSDR Social Vulnerability Index 2022, retrieved May 3, 2026).
How many federally declared disasters has ZIP 62631 experienced?
FEMA has recorded 17 federal disaster declarations affecting ZIP 62631 between 1973–2023 (FEMA OpenFEMA Disaster Declarations, retrieved May 3, 2026).
What kinds of disasters most often hit ZIP 62631?
Flood is the most common federally declared disaster type affecting ZIP 62631, accounting for 6 of 17 declarations (35%, FEMA OpenFEMA, retrieved May 3, 2026).
What was the most recent disaster declared for ZIP 62631?
The most recent FEMA disaster declaration affecting ZIP 62631 was "SEVERE STORMS AND FLOODING" — a severe storm declared in 2023 (DR-4728) (FEMA OpenFEMA, retrieved May 3, 2026).
What colleges are near ZIP 62631?
2 colleges and universities are listed near ZIP 62631 by the U.S. Department of Education College Scorecard, including Illinois College and Blackburn College (retrieved May 2, 2026).
What is the average tuition at colleges near ZIP 62631?
Median in-state tuition across 2 nearby institutions is $33,413 (College Scorecard, retrieved May 2, 2026).
What do graduates earn from colleges near ZIP 62631?
Graduates of nearby colleges earn a median of $49,689 ten years after entry (College Scorecard, retrieved May 2, 2026).
What is the climate like in ZIP 62631?
ZIP 62631 has an average annual temperature of 52.7°F and 39.3" of annual precipitation based on the JACKSONVILLE 2E, IL US weather station 10.5 miles from the ZIP centroid (NOAA 1991–2020 Climate Normals, retrieved May 8, 2026).
What taxes apply in ZIP 62631?
Illinois has a graduated income tax with a top rate of unspecified. Combined sales tax: 8.96% (Tax Foundation 2025).
Does Illinois have paid family leave?
Illinois has no state paid family leave program (Bipartisan Policy Center 2026).
What data is available for ZIP 62631?
This page covers health outcomes from CDC PLACES (40 metrics), school information from NCES CCD (2 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 (2 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 (17 on record), climate normals from NOAA NCEI (1991-2020), county-level crime data from the FBI Crime Data Explorer (2024), and state-level tax rates from the Tax Foundation. Data is refreshed on Mubboo's standard schedule.
How current is this data?
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 (17 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). State-level tax rates retrieved 2026-05-05 15:58:22.284+00 from the Tax Foundation.
Other ZIPs near 62631
Nearby ZIPs by distance
62628 (Chapin, 4.2 mi) · 62611 (Arenzville, 4.6 mi) · 62665 (Meredosia, 9.3 mi) · 62650 (Jacksonville, 9.4 mi) · 62622 (10.4 mi) · 62691 (Virginia, 11.2 mi)
Compare ZIP-level stats — population, schools, housing, climate — across nearby areas. Source: U.S. Census Bureau ZCTA basemap.
More Info topics
Have a specific question about ZIP 62631?
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
27th percentile
Moderate Vulnerability
Based on 1 census tract, population 293
Vulnerability Themes
Households Without Vehicle
4
Persons with Disability
60
Without HS Diploma
20
Without Health Insurance
8
Adults Age 65+
69
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.