Tom Green County
Texas · County seat: San Angelo · Active county or equivalent
FIPS code 48451 is Tom Green County, Texas. With a population of 119,276 (2022 ACS estimate), it ranks #38 in Texas and #525 nationally. Tom Green County is part of the San Angelo, TX. The state FIPS code for Texas is 48. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
48451
Population
119,276
2022 ACS · #525 nationally
Density
78.4/mi²
people per sq mile
Land Area
1,522
sq miles
Urban/Rural
Metro — under 250K population
RUCC 3
How This FIPS Code Works
The 5-digit FIPS code 48451 is formed by combining the 2-digit state identifier 48 (Texas) with the 3-digit county identifier 451. Together they uniquely identify Tom Green County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 48451
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 48451.
Median Household Income
$67,215
ACS B19013_001E
Poverty Rate
11.7%
ACS B17001 (below poverty level)
Median Age
35.0
ACS B01002_001E
Metropolitan Area
Adjacent Counties (8)
Counties that share a border with Tom Green County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 48451.
Federal Datasets Using Code 48451
FIPS code 48451 appears as the county identifier in the following federal datasets. Analysts joining data across these sources use this code as the common geographic key.
Using FIPS Code 48451 in Code
Common patterns for querying federal datasets by this county's FIPS code. The leading zeros are significant — always treat FIPS codes as strings, not integers.
import requests
url = "https://api.census.gov/data/2022/acs/acs5"
params = {
"get": "NAME,B19013_001E,B01003_001E",
"for": "county:451",
"in": "state:48",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Tom Green County, Texas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '48451';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '48'
AND county_fips = '451';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 48451 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "48",
county = "451",
year = 2022
)ZIP Codes in Tom Green County
ZIP codes do not align perfectly with county boundaries — a single ZIP code can span multiple counties, and a county can contain parts of many ZIP codes. The ratios below (from the Census 2020 ZCTA relationship file) show the land area share of each ZCTA that falls within Tom Green County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 76958 | 100.0% |
| 76905 | 100.0% |
| 76908 | 100.0% |
| 76909 | 100.0% |
| 76934 | 100.0% |
| 76939 | 100.0% |
| 76940 | 100.0% |
| 76957 | 100.0% |
| 76902 | 100.0% |
| 76903 | 100.0% |
| 76904 | 92.1% |
| 76937 | 80.4% |
| 76955 | 74.2% |
| 76901 | 72.3% |
| 76861 | 60.0% |
| 76935 | 48.7% |
| 76945 | 4.1% |