Population & age
- Total population
- 23,215
- Median age
- 39.2
Galveston County · Houston-Pasadena-The Woodlands, TX · Population 23,215
Galveston, TX (ZIP 77550) sits in Galveston County within the Houston-Pasadena-The Woodlands metro area. The page draws on 2 federal data feeds retrieved Apr 24. Top health signal: High Blood Pressure comes in above the national average at 40.7%. NCES lists 8 schools serving the area, 8 non-charter. 10 colleges and universities serve the area, with median in-state tuition of $2,505. IRS data shows average household income (AGI) of $78,065, well above the ~$45K national average per return. CDC's Social Vulnerability Index places this ZIP in the 79th percentile nationally — a highly vulnerable community profile. FEMA has issued 31 federal disaster declarations affecting this ZIP since 1973 — a high-frequency exposure profile. 34.5% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. Texas has no state income tax, saving the local median household (AGI $78,065) approximately $3,591/year vs the US average effective state tax rate. IRS migration data (2022-2023) shows a net gain of 2,388 residents (991 households) — the ZIP's primary county is growing. Schools are the headline here — lots of options at varying types — while healthcare access numbers suggest worth-shopping coverage and provider choice carefully. Notable: median household income $47,366, fair market rent of $1,380 for a two-bedroom, and a typical home value of $290,387, down 7.6% 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
$1,120
/month
1 Bed
$1,160
/month
2 Bed
$1,380
/month
3 Bed
$1,860
/month
4 Bed
$2,320
/month
HUD Fair Market Rents represent the 40th percentile of standard-quality rental housing in this area. FY2026 data.
$290,387
Zillow Home Value Index (ZHVI) · as of March 2026
-7.6%
vs. March 2025
+16.6%
vs. March 2021
Houston-The Woodlands-Sugar Land, TX
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
3,148
Across 3,148 permitted buildings. Total construction value: $894.3M.
Single-family
3,148
100% of total units
Multifamily (2+ unit)
0
0% of total units
Single-family value
$894.3M
construction value
Multifamily value
$0
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.
Tax returns filed
9,600
Average AGI
$78,065
Avg property tax
$351
EITC participation
22.6%
Income distribution
Avg mortgage interest
$360
Avg charitable contribution
$648
Avg capital gains
$3,971
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 $749.4M across all reported brackets.
Business establishments
710
Total employment
10,490
Annual payroll
$463.8M
Average annual pay
$44,212
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
$62,650
Average weekly wage
$1,205
Total employment
122,734
Total establishments
6,943
That is roughly 4% 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 rate
4.3%
That is 0.3 percentage points above the US national unemployment rate of about 4.0%.
Labor force
183,079
Employed
175,226
Unemployed
7,853
Based on Galveston County, TX 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
6
Typical banking access
A standard suburban / mid-density branch count for this area.
Total deposits
$1.3B
across all branches in this ZIP
Distinct institutions
5
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.
Facilities located inside ZIP 77550 from CMS Provider Data. Star ratings reflect Overall Hospital Quality where applicable; “Not rated” means the facility didn't report enough measures to qualify.
Hospitals (1)
SHRINERS HOSPITALS FOR CHILDREN
815 MARKET STREET, GALVESTON, TX, 77550
Source: Centers for Medicare & Medicaid Services Provider Data (data.cms.gov). Public domain.
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
Galveston--Texas City, TX
Reporting agencies
9
Largest: City of Galveston
Annual ridership
—
unlinked trips · 2024
Source: U.S. Federal Transit Administration, National Transit Database (transit.dot.gov). Public domain.
Public EV charging stations
9
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
35
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 central
Avg hours / week
57.8
across outlets in this ZIP
Avg square feet
75,000
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
31
Date Range
1973–2024
Most Recent Declaration
HURRICANE BERYL
Hurricane — declared July 9, 2024 (DR-4798)
Incident period: July 5, 2024 – July 9, 2024
Top Incident Types
Individual Assistance
12
Direct help to disaster survivors
Households Program
8
Housing & temporary lodging support
Public Assistance
26
Repair of public facilities & roads
Hazard Mitigation
13
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
72.3°F
65.8° – 78.8°
Annual precipitation
47.2"
Annual snowfall
0.1"
Heating · cooling days
889.4 · 3,571
Annual base 65°F
Nearest station: GALVESTON SCHOLES FLD, TX US, 5.9 miles from the centroid of Galveston, TX (ZIP 77550)
Source: NOAA National Centers for Environmental Information, 1991–2020 U.S. Climate Normals (ncei.noaa.gov). Public domain.
Median daily AQI
44
GoodPeak AQI (2024)
159
Unhealthy
Primary pollutant
Ozone
224 days as main pollutant
Days measured
362
Based on Galveston 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)
8,976
That is roughly 776 years per 100,000 above 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
3.9
avg per adult per month
Poor mental health days
5.3
avg per adult per month
Uninsured
15.8%
of residents under 65
Primary care MDs
70
per 100,000 residents
Preventable hospital stays
3,666
per 100K Medicare enrollees
Food environment (0-10)
7.3
10 = best access & security
Exercise access
85%
residents near a facility
Flu vaccinated
47%
of Medicare enrollees
Low birth weight (under 2,500 g) accounts for 8.8% of live births in this county — an early-life health input that downstream outcomes track against.
Based on Galveston 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
34.5% of Galveston County, TX residents live more than 1 mile (urban) or 10 miles (rural) from the nearest supermarket.
Grocery stores
0.13
per 1,000 residents
Supercenters & clubs
0.02
per 1,000 residents
SNAP-authorized stores
0.78
accepting food benefits
Fast-food restaurants
0.76
per 1,000 residents
Among low-income residents, 8.7% 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 Galveston County, TX 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 · 149 reports
Property crime rate
—
per 100K residents · 384 reports
Homicide
2
Robbery
12
Burglary
91
Vehicle theft
69
County-level data for Galveston (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)
▲+2,388 people
+991 households • +$107.3M net AGI flow
Moved in
13,055households
23,616 people • $1.1B AGI
Moved out
12,064households
21,228 people • $946.9M AGI
Where new residents came from
Where departing residents went
Incoming households reported an average AGI of $80,755 versus departing households' $78,492.
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 77550. Numbers reflect the most recent published year per source.
Income tax
None
No state income tax
Sales tax (combined)
8.20%
State 6.25% · avg local 1.95%
Property tax (effective)
1.42%
Median $1,254/year
Tax burden rank
4 of 50
8.40% of personal income
For ZIP 77550: A household at this ZIP's median AGI of $78,065 keeps approximately $3,591 more annually than residents of the typical income-tax state. Applied to this ZIP's typical home value of $290,387, that works out to roughly $4,133/year in property tax.
Program
Voluntary (private insurance framework)
Voluntary (private insurance framework)
SNAP eligibility
165% FPL
Broad-Based Categorical Eligibility (raises gross income limit above federal 130% floor). Asset limit $5,000.
Sources: Tax Foundation (state tax rates & brackets), Bipartisan Policy Center (paid family leave), USDA FNS (SNAP categorical eligibility).
Other ZIPs in Galveston
Nearby ZIPs by distance
77555 (Galveston, 0.5 mi) · 77551 (Galveston, 4.3 mi) · 77590 (Texas City, 10.1 mi) · 77554 (Galveston, 10.6 mi) · 77650 (Bolivar Peninsula, 11 mi) · 77568 (La Marque, 13.8 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.
37.9%
4.9pp above the 33.0% national rate.
40.7%
8.7pp above the 32.0% national rate.
22.2%
Tracks close to the 22.0% national rate.
75.4%
Tracks close to the 76.0% national rate.
18.6%
5.6pp above the 13.0% national rate.
16.0%
5.0pp above the 11.0% national rate.
8 schools serve this ZIP, including 8 non-charter.
| School | Type | Grades | Enrollment |
|---|---|---|---|
| BALL H S | Public | 9–12 | 2,053 |
| COLLEGIATE ACADEMY | Public | 5–9 | 692 |
| CENTRAL MIDDLE | Public | 5–8 | 583 |
| AUSTIN MIDDLE | Public | 5–8 | 574 |
| BURNET EL | Public | -1–4 | 517 |
Showing top 5 by enrollment. 3 more schools serve this ZIP.
Schools listed from NCES Common Core of Data via the Urban Institute Education Data Portal.
Fresh.NCES CCD via Urban Institute EDP · Apr 23, 2026Colleges in this area
10
Median in-state tuition
$2,505
Median earnings (10 yr)
$40,909
Galveston, TX · 77550
Pasadena, TX · 77505
Baytown, TX · 77520
Texas City, TX · 77591
Alvin, TX · 77511
Lake Jackson, TX · 77566
Galveston, TX · 77555
Webster, TX · 77598
League City, TX · 77573
Pasadena, TX · 77502
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.
Galveston, TX (ZIP 77550) sits in Galveston County within the Houston-Pasadena-The Woodlands metro area. The page draws on 2 federal data feeds retrieved Apr 24. Top health signal: High Blood Pressure comes in above the national average at 40.7%. NCES lists 8 schools serving the area, 8 non-charter. 10 colleges and universities serve the area, with median in-state tuition of $2,505. IRS data shows average household income (AGI) of $78,065, well above the ~$45K national average per return. CDC's Social Vulnerability Index places this ZIP in the 79th percentile nationally — a highly vulnerable community profile. FEMA has issued 31 federal disaster declarations affecting this ZIP since 1973 — a high-frequency exposure profile. 34.5% of residents in this county are flagged low-access by USDA's 2025 Food Environment Atlas — a notable supermarket-access gap. Texas has no state income tax, saving the local median household (AGI $78,065) approximately $3,591/year vs the US average effective state tax rate. IRS migration data (2022-2023) shows a net gain of 2,388 residents (991 households) — the ZIP's primary county is growing. Schools are the headline here — lots of options at varying types — while healthcare access numbers suggest worth-shopping coverage and provider choice carefully. Notable: median household income $47,366, fair market rent of $1,380 for a two-bedroom, and a typical home value of $290,387, down 7.6% 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.
These two readings tell a consistent story. Strong access numbers usually correlate with denser provider networks, and a high school count signals the population base that supports them. Reading them together: a household weighing this ZIP for a multi-year stay can expect both healthcare and education infrastructure to keep pace.
One concrete reading worth keeping: Depression prevalence sits near the national rate at 22.2%. 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.
37.9%, which is 4.9 percentage points above the national average of 33.0% (CDC PLACES, retrieved Apr 24, 2026).
22.2%, which is 0.2 percentage points above the national average of 22.0% (CDC PLACES, retrieved Apr 24, 2026).
40.7%, which is 8.7 percentage points above the national average of 32.0% (CDC PLACES, retrieved Apr 24, 2026).
8 schools serve this ZIP, including 8 public schools (NCES CCD, retrieved Apr 23, 2026). No charter schools are listed in this ZIP by NCES CCD.
No charter schools are listed in ZIP 77550 by NCES CCD (retrieved Apr 23, 2026).
Yes, 3 high schools serve this ZIP: Ball H S, Collegiate Academy, Aim College & Career Prep. (NCES CCD, retrieved Apr 23, 2026).
23,215 people live in ZIP 77550, with a median age of 39.2 (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
$47,366 per year (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
In ZIP 77550, 41.3% of occupied housing units are owner-occupied and 58.7% are renter-occupied (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
In ZIP 77550, 10.0% of workers work from home. Public transit is used by 1.1% of commuters (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
23.3% of the population in ZIP 77550 lives below the federal poverty line (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
86.6% of households in ZIP 77550 have broadband internet access (Census ACS 5-Year 2022, retrieved Apr 30, 2026).
The typical home value in ZIP 77550 is $290,387, down 7.6% from a year ago (Zillow Home Value Index, retrieved May 1, 2026).
Home values are down 7.6% over the past year and up 16.6% over the past five years (Zillow Home Value Index, retrieved May 1, 2026).
The average Adjusted Gross Income reported on tax returns from ZIP 77550 (Galveston, TX) is $78,065 per return (IRS SOI Tax Year 2022, retrieved May 2, 2026).
Tax returns from ZIP 77550 report an average of $351 per return in real-estate tax deductions (IRS SOI Tax Year 2022, retrieved May 2, 2026).
5.8% of tax returns from ZIP 77550 (Galveston, TX) report Adjusted Gross Income of $200,000 or more (IRS SOI Tax Year 2022, retrieved May 2, 2026).
As of 2022, 710 business establishments operated in ZIP 77550 employing 10,490 workers (Census ZIP Business Patterns, retrieved May 3, 2026).
The average annual pay across all local establishments in ZIP 77550 is $44,212, based on Census ZIP Business Patterns 2022 data (retrieved May 3, 2026).
According to the CDC Social Vulnerability Index (2022), ZIP 77550 ranks in the 79th percentile nationally for social vulnerability — a very high vulnerability profile (retrieved May 3, 2026).
Socioeconomic Status is the highest-scoring CDC SVI theme for ZIP 77550, ranking in the 81th percentile nationally (CDC/ATSDR Social Vulnerability Index 2022, retrieved May 3, 2026).
FEMA has recorded 31 federal disaster declarations affecting ZIP 77550 between 1973–2024 (FEMA OpenFEMA Disaster Declarations, retrieved May 3, 2026).
Hurricane is the most common federally declared disaster type affecting ZIP 77550, accounting for 14 of 31 declarations (45%, FEMA OpenFEMA, retrieved May 3, 2026).
The most recent FEMA disaster declaration affecting ZIP 77550 was "HURRICANE BERYL" — a hurricane declared in 2024 (DR-4798) (FEMA OpenFEMA, retrieved May 3, 2026).
10 colleges and universities are listed near ZIP 77550 by the U.S. Department of Education College Scorecard, including Galveston College, San Jacinto Community College, and Lee College (retrieved May 2, 2026).
Median in-state tuition across 10 nearby institutions is $2,505 (College Scorecard, retrieved May 2, 2026).
Graduates of nearby colleges earn a median of $40,909 ten years after entry (College Scorecard, retrieved May 2, 2026).
ZIP 77550 has an average annual temperature of 72.3°F and 47.2" of annual precipitation based on the GALVESTON SCHOLES FLD, TX US weather station 5.9 miles from the ZIP centroid (NOAA 1991–2020 Climate Normals, retrieved May 8, 2026).
Yes — ZIP 77550 is part of the Galveston--Texas City, TX urbanized area, primarily served by City of Galveston (National Transit Database 2024, retrieved May 4, 2026).
1 hospital is located in ZIP 77550 (CMS Hospital Compare, 2024).
Texas has no state income tax. For a household earning the local median AGI of $78,065, this saves approximately $3,591 per year compared to the national average effective state tax rate. The combined state and local sales tax rate is 8.20% (Tax Foundation 2025).
Texas runs an active paid family leave program offering up to — weeks of paid leave per year (Bipartisan Policy Center 2026).
This page covers health outcomes from CDC PLACES (33 metrics), school information from NCES CCD (8 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 (10 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 (31 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), hospitals from CMS Hospital Compare, 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 23, 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 (31 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.
Other ZIPs in Galveston
Nearby ZIPs by distance
77555 (Galveston, 0.5 mi) · 77551 (Galveston, 4.3 mi) · 77590 (Texas City, 10.1 mi) · 77554 (Galveston, 10.6 mi) · 77650 (Bolivar Peninsula, 11 mi) · 77568 (La Marque, 13.8 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 77550?
Ask Mubboo — launching Q4 2026.
Data refreshed via Mubboo's ETL pipeline; oldest source on this page retrieved Apr 23, 2026.
Social Vulnerability Index
Overall SVI
79th percentile
Very High Vulnerability
Based on 16 census tracts, population 23,273
Vulnerability Themes
Households Without Vehicle
1,748
Limited English Speakers
1,152
Persons with Disability
4,047
Without HS Diploma
2,332
Without Health Insurance
4,348
Adults Age 65+
4,377
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.