Population & age
- Total population
- 2,414
- Median age
- 36.8
ZIP 32831, FL (32831)
Orange County · Orlando-Kissimmee-Sanford, FL · Population 2,414
Fresh.Data current as of Apr 24, 2026
FL 32831 (ZIP 32831) sits in Orange County within the Orlando-Kissimmee-Sanford metro area. The page draws on 1 federal data feed retrieved Apr 24. Top health signal: Depression comes in below the national average at 12.5%. No NCES schools are mapped to this ZIP in the current dataset. 10 colleges and universities serve the area, with median in-state tuition of $9,972. Federal QCEW filings show 949,918 covered jobs in this ZIP's primary county — a major regional employment hub. The CDC SVI flags housing & transportation (98th percentile) as this ZIP's standout vulnerability dimension, sitting well above its overall 64th-percentile score. FEMA has issued 39 federal disaster declarations affecting this ZIP since 1977 — a high-frequency exposure profile. Annual precipitation averages 51.5" — a wet-climate ZCTA per NOAA's 1991–2020 Normals. Fast-food restaurants outnumber grocery stores roughly 5-to-1 per capita (USDA Food Environment Atlas) — a "food swamp" pattern often linked to higher diet-related disease prevalence. Florida has no state income tax (Tax Foundation 2025). New residents arriving here predominantly come from Seminole County, FL (IRS SOI Migration, 2022-2023). Both healthcare access and on-paper school density skew lighter than national norms; what shows up here is a snapshot, not a verdict — neighborhood-level texture matters at this scale. Notable: fair market rent of $2,210 for a two-bedroom and a low 0.0% poverty rate. 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
- 46.0%
- Black
- 45.3%
- Asian
- 0.0%
- Hispanic / Latino
- 9.9%
- Other / multi-racial
- 8.2%
Education
- Bachelor's degree or higher (age 25+)
- 2.5%
Employment
- Unemployment rate
- 0.0%
Housing
- Owner-occupied
- 14(58.3%)
- Renter-occupied
- 10(41.7%)
- Vacant units
- 21
- Built (median)
- 1989
Commute
- Public transit
- 0(0.0%)
- Work from home
- 0(0.0%)
Economic wellbeing
- Below poverty line
- 0(0.0%)
- Uninsured
- 0(0.0%)
Digital access
- Broadband access
- 24(100.0%)
Language & nativity
- Foreign-born
- 49(2.0%)
- Non-English at home
- 237(9.8%)
Fair Market Rent
Fresh.HUD SAFMR · May 1, 2026Studio
$1,850
/month
1 Bed
$1,940
/month
2 Bed
$2,210
/month
3 Bed
$2,770
/month
4 Bed
$3,280
/month
HUD Fair Market Rents represent the 40th percentile of standard-quality rental housing in this area. FY2026 data.
New housing construction
New housing units permitted
8,052
Across 4,916 permitted buildings. Total construction value: $2.27B.
Single-family
4,810
60% of total units
Multifamily (2+ unit)
3,242
40% of total units
Single-family value
$1.73B
construction value
Multifamily value
$544.9M
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.
Business & employment
Business establishments
7
Total employment
78
Annual payroll
$6.1M
Average annual pay
$78,333
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
$67,805
Average weekly wage
$1,304
Total employment
949,918
Total establishments
56,038
That is roughly 4% 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
Unemployment rate
3.3%
That is 0.7 percentage points below the US national unemployment rate of about 4.0%.
Labor force
824,458
Employed
797,663
Unemployed
26,795
Based on Orange County, FL 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.
Public transit
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
Leesburg--Eustis--Tavares, FL
Reporting agencies
3
Largest: Central Florida Commuter Rail
Annual ridership
—
unlinked trips · 2024
Source: U.S. Federal Transit Administration, National Transit Database (transit.dot.gov). Public domain.
Alternative-fuel stations
Public EV charging stations
1
Limited EV charging
A small number of public charging stations — viable for EV ownership with home charging, but minimal redundancy.
Level 2 ports
2
AC charging — workplace, retail, home
DC Fast ports
0
Highway-class fast charging
Charging networks
- CHARGEUP
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.
Federal Disaster Declarations
Federally Declared Disasters
39
Date Range
1977–2024
Most Recent Declaration
HURRICANE MILTON
Hurricane — declared October 11, 2024 (DR-4834)
Incident period: October 5, 2024 – November 2, 2024
Top Incident Types
- Hurricane19 (49%)
- Fire5 (13%)
- Freezing5 (13%)
- Tropical Storm4 (10%)
- Severe Storm3 (8%)
- Other3 (8%)
Individual Assistance
13
Direct help to disaster survivors
Households Program
9
Housing & temporary lodging support
Public Assistance
31
Repair of public facilities & roads
Hazard Mitigation
14
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
73°F
62.7° – 83.2°
Annual precipitation
51.5"
Diurnal range
20.5°F
Day-night swing
Heating · cooling days
524.9 · 3,451.6
Annual base 65°F
Nearest station: ORLANDO INTL AP, FL US, 11.4 miles from the centroid of ZIP 32831 (ZIP 32831)
Source: NOAA National Centers for Environmental Information, 1991–2020 U.S. Climate Normals (ncei.noaa.gov). Public domain.
Air quality
Median daily AQI
41
GoodGood 272dModerate 86dUSG 2d
Peak AQI (2024)
121
Unhealthy for Sensitive Groups
Primary pollutant
Ozone
214 days as main pollutant
Days measured
360
Based on Orange 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.
Community health profile
Years of potential life lost (per 100K)
7,030
That is roughly 1,170 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
18%
of adults self-report
Poor physical health days
4.2
avg per adult per month
Poor mental health days
5.7
avg per adult per month
Uninsured
13.2%
of residents under 65
Primary care MDs
93
per 100,000 residents
Preventable hospital stays
3,838
per 100K Medicare enrollees
Food environment (0-10)
8.0
10 = best access & security
Exercise access
91%
residents near a facility
Flu vaccinated
41%
of Medicare enrollees
Low birth weight (under 2,500 g) accounts for 9.0% of live births in this county — an early-life health input that downstream outcomes track against.
Based on Orange 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
Moderate food access challenges
22.1% of Orange County, FL residents live more than 1 mile (urban) or 10 miles (rural) from the nearest supermarket.
Grocery stores
0.17
per 1,000 residents
Supercenters & clubs
0.02
per 1,000 residents
SNAP-authorized stores
0.68
accepting food benefits
Fast-food restaurants
0.85
per 1,000 residents
Among low-income residents, 7.2% 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 Orange County, FL 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).
Who’s moving in and out
Net migration (2022-2023)
▼−9,474 people
−3,818 households • +$90.8M net AGI flow
Moved in
57,730households
93,601 people • $3.9B AGI
Moved out
61,548households
103,075 people • $3.8B AGI
Where new residents came from
- Seminole County, FL — 6,288 households
- Osceola County, FL — 5,567 households
- Polk County, FL — 2,300 households
- Lake County, FL — 2,145 households
- Miami-Dade County, FL — 2,072 households
Where departing residents went
- Seminole County, FL — 7,701 households
- Osceola County, FL — 7,271 households
- Lake County, FL — 4,390 households
- Polk County, FL — 4,119 households
- Volusia County, FL — 2,023 households
Incoming households reported an average AGI of $66,812 versus departing households' $61,193.
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 Florida
State-level rules that apply to every resident of ZIP 32831. Numbers reflect the most recent published year per source.
Tax rates
Income tax
None
No state income tax
Sales tax (combined)
6.98%
State 6.00% · avg local 0.98%
Property tax (effective)
0.50%
Median $787/year
Tax burden rank
8 of 50
8.90% of personal income
Paid family leave
Program
Voluntary (private insurance framework)
Voluntary (private insurance framework)
Safety net
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).
Other ZIPs near 32831
Nearby ZIPs by distance
32828 (Alafaya, 3.3 mi) · 32833 (Wedgefield, 3.9 mi) · 32829 (Orlando, 4.7 mi) · 32832 (Orlando, 6.2 mi) · 32820 (Bithlo, 6.3 mi) · 32825 (Alafaya, 6.8 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
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
34.1%
Tracks close to the 33.0% national rate.
High Blood Pressure
29.5%
2.5pp below the 32.0% national rate.
Depression
12.5%
9.5pp below the 22.0% national rate.
Annual Checkup
70.1%
5.9pp below the 76.0% national rate.
Health Insurance
15.8%
2.8pp above the 13.0% national rate.
Diabetes
8.4%
2.6pp below the 11.0% national rate.
Colleges & universities nearby
Colleges in this area
10
Median in-state tuition
$9,972
Median earnings (10 yr)
$38,622
- 4-Year
University of Central Florida
Orlando, FL · 32816
- In-state tuition
- $6,368
- Out-of-state tuition
- $22,467
- Acceptance rate
- 40.1%
- Graduation rate
- 76.6%
- Median earnings (10 yr)
- $58,308
- Median student debt
- $18,190
- 4-Year
Valencia College
Orlando, FL · 32811
- In-state tuition
- $2,664
- Out-of-state tuition
- $9,576
- Acceptance rate
- —
- Graduation rate
- 45.6%
- Median earnings (10 yr)
- $40,594
- Median student debt
- $9,300
- 4-Year
Ana G. Mendez University
Orlando, FL · 32822
- In-state tuition
- $13,575
- Out-of-state tuition
- $13,575
- Acceptance rate
- —
- Graduation rate
- —
- Median earnings (10 yr)
- —
- Median student debt
- $12,188
- 2-Year
Southern Technical College
Orlando, FL · 32809
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- 58.8%
- Median earnings (10 yr)
- $29,893
- Median student debt
- $11,250
- 4-Year
AdventHealth University
Orlando, FL · 32803
- In-state tuition
- $21,420
- Out-of-state tuition
- $21,420
- Acceptance rate
- —
- Graduation rate
- 37.2%
- Median earnings (10 yr)
- $72,282
- Median student debt
- $24,590
- 2-Year
Orange Technical College-South Campus
Orlando, FL · 32809
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- 40.2%
- Median earnings (10 yr)
- $33,350
- Median student debt
- —
- 2-Year
Universal Technical Institute-Orlando
Orlando, FL · 32837
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- 65.1%
- Median earnings (10 yr)
- $48,341
- Median student debt
- $13,097
- Certificate
Florida Institute of Recording Sound and Technology
Orlando, FL · 32810
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- —
- Median earnings (10 yr)
- —
- Median student debt
- $9,500
- 4-Year
Gwinnett Institute
Orlando, FL · 32826
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- —
- Median earnings (10 yr)
- $33,735
- Median student debt
- $13,000
- 2-Year
Orange Technical College
Orlando, FL · 32801
- In-state tuition
- —
- Out-of-state tuition
- —
- Acceptance rate
- —
- Graduation rate
- 71.2%
- Median earnings (10 yr)
- $36,650
- Median student debt
- —
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
FL 32831 (ZIP 32831) sits in Orange County within the Orlando-Kissimmee-Sanford metro area. The page draws on 1 federal data feed retrieved Apr 24. Top health signal: Depression comes in below the national average at 12.5%. No NCES schools are mapped to this ZIP in the current dataset. 10 colleges and universities serve the area, with median in-state tuition of $9,972. Federal QCEW filings show 949,918 covered jobs in this ZIP's primary county — a major regional employment hub. The CDC SVI flags housing & transportation (98th percentile) as this ZIP's standout vulnerability dimension, sitting well above its overall 64th-percentile score. FEMA has issued 39 federal disaster declarations affecting this ZIP since 1977 — a high-frequency exposure profile. Annual precipitation averages 51.5" — a wet-climate ZCTA per NOAA's 1991–2020 Normals. Fast-food restaurants outnumber grocery stores roughly 5-to-1 per capita (USDA Food Environment Atlas) — a "food swamp" pattern often linked to higher diet-related disease prevalence. Florida has no state income tax (Tax Foundation 2025). New residents arriving here predominantly come from Seminole County, FL (IRS SOI Migration, 2022-2023). Both healthcare access and on-paper school density skew lighter than national norms; what shows up here is a snapshot, not a verdict — neighborhood-level texture matters at this scale. Notable: fair market rent of $2,210 for a two-bedroom and a low 0.0% poverty rate. Every figure on this page links to its underlying federal dataset with a retrieval date so you can audit the freshness yourself.
Both surfaces skew lighter than national averages. That isn’t a verdict — small-area estimates compress real neighborhood-level texture, and a single ZIP reading can miss a district line or a hospital corridor sitting just outside it. Treat this as a starting point for fieldwork, not a conclusion.
One concrete reading worth keeping: Depression prevalence sits lower the national rate at 12.5%. 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 32831
What is the obesity rate in ZIP 32831?
34.1%, which is 1.1 percentage points above the national average of 33.0% (CDC PLACES, retrieved Apr 24, 2026).
What is the depression rate in ZIP 32831?
12.5%, which is 9.5 percentage points below the national average of 22.0% (CDC PLACES, retrieved Apr 24, 2026).
What is the high blood pressure rate in ZIP 32831?
29.5%, which is 2.5 percentage points below the national average of 32.0% (CDC PLACES, retrieved Apr 24, 2026).
What is the population of ZIP 32831?
2,414 people live in ZIP 32831, with a median age of 36.8 (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
Is ZIP 32831 mostly renters or homeowners?
In ZIP 32831, 58.3% of occupied housing units are owner-occupied and 41.7% are renter-occupied (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
How do people commute in ZIP 32831?
In ZIP 32831, 0.0% 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 32831?
0.0% of the population in ZIP 32831 lives below the federal poverty line (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
What percentage of households in ZIP 32831 have broadband internet?
100.0% of households in ZIP 32831 have broadband internet access (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
How many businesses are in ZIP 32831?
As of 2022, 7 business establishments operated in ZIP 32831 employing 78 workers (Census ZIP Business Patterns, retrieved May 3, 2026).
What is the average salary in ZIP 32831?
The average annual pay across all local establishments in ZIP 32831 is $78,333, based on Census ZIP Business Patterns 2022 data (retrieved May 3, 2026).
How vulnerable is ZIP 32831 to disasters and public health emergencies?
According to the CDC Social Vulnerability Index (2022), ZIP 32831 ranks in the 64th percentile nationally for social vulnerability — a high vulnerability profile (retrieved May 3, 2026).
What is the biggest vulnerability factor in ZIP 32831?
Housing Type & Transportation is the highest-scoring CDC SVI theme for ZIP 32831, ranking in the 98th percentile nationally (CDC/ATSDR Social Vulnerability Index 2022, retrieved May 3, 2026).
How many federally declared disasters has ZIP 32831 experienced?
FEMA has recorded 39 federal disaster declarations affecting ZIP 32831 between 1977–2024 (FEMA OpenFEMA Disaster Declarations, retrieved May 3, 2026).
What kinds of disasters most often hit ZIP 32831?
Hurricane is the most common federally declared disaster type affecting ZIP 32831, accounting for 19 of 39 declarations (49%, FEMA OpenFEMA, retrieved May 3, 2026).
What was the most recent disaster declared for ZIP 32831?
The most recent FEMA disaster declaration affecting ZIP 32831 was "HURRICANE MILTON" — a hurricane declared in 2024 (DR-4834) (FEMA OpenFEMA, retrieved May 3, 2026).
What colleges are near ZIP 32831?
10 colleges and universities are listed near ZIP 32831 by the U.S. Department of Education College Scorecard, including University Of Central Florida, Valencia College, and Ana G. Mendez University (retrieved May 2, 2026).
What is the average tuition at colleges near ZIP 32831?
Median in-state tuition across 10 nearby institutions is $9,972 (College Scorecard, retrieved May 2, 2026).
What do graduates earn from colleges near ZIP 32831?
Graduates of nearby colleges earn a median of $38,622 ten years after entry (College Scorecard, retrieved May 2, 2026).
What is the climate like in ZIP 32831?
ZIP 32831 has an average annual temperature of 73.0°F and 51.5" of annual precipitation based on the ORLANDO INTL AP, FL US weather station 11.4 miles from the ZIP centroid (NOAA 1991–2020 Climate Normals, retrieved May 8, 2026).
Does ZIP 32831 have public transit?
Yes — ZIP 32831 is part of the Leesburg--Eustis--Tavares, FL urbanized area, primarily served by Central Florida Commuter Rail (National Transit Database 2024, retrieved May 4, 2026).
What taxes apply in ZIP 32831?
Florida has no state income tax. The combined state and local sales tax rate is 6.98% (Tax Foundation 2025).
Does Florida have paid family leave?
Florida runs an active paid family leave program offering up to — weeks of paid leave per year (Bipartisan Policy Center 2026).
What data is available for ZIP 32831?
This page covers health outcomes from CDC PLACES (33 metrics), demographics from the Census ACS 5-Year (2022), colleges from the U.S. Department of Education College Scorecard (10 institutions), local business & employment from Census ZIP Business Patterns (2022), social vulnerability scores from the CDC/ATSDR SVI (2022), federal disaster declarations from FEMA OpenFEMA (39 on record), climate normals from NOAA NCEI (1991-2020), 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.
How current is this data?
Health data retrieved Apr 24, 2026 from CDC PLACES. Demographics retrieved Apr 30, 2026 from Census ACS 5-Year (2022). College data retrieved May 2, 2026 from U.S. Dept of Education College Scorecard. 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 (39 on record). Climate normals retrieved May 8, 2026 from NOAA NCEI (1991-2020). 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.
Other ZIPs near 32831
Nearby ZIPs by distance
32828 (Alafaya, 3.3 mi) · 32833 (Wedgefield, 3.9 mi) · 32829 (Orlando, 4.7 mi) · 32832 (Orlando, 6.2 mi) · 32820 (Bithlo, 6.3 mi) · 32825 (Alafaya, 6.8 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 32831?
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
64th percentile
High Vulnerability
Based on 1 census tract, population 5,088
Vulnerability Themes
Households Without Vehicle
47
Limited English Speakers
190
Persons with Disability
210
Without HS Diploma
784
Without Health Insurance
326
Adults Age 65+
255
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.