FIPS code 48015 is Austin County, Texas. With a population of 30,406 (2022 ACS estimate), it ranks #94 in Texas and #1455 nationally. Austin County is part of the Houston-Pasadena-The Woodlands, 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
48015
Population
30,406
2022 ACS · #1455 nationally
Density
47.0/mi²
people per sq mile
Land Area
647
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 48015 is formed by combining the 2-digit state identifier 48 (Texas) with the 3-digit county identifier 015. Together they uniquely identify Austin County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 48015
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 48015.
Median Household Income
$73,556
ACS B19013_001E
Poverty Rate
11.9%
ACS B17001 (below poverty level)
Median Age
41.0
ACS B01002_001E
Metropolitan Area
Adjacent Counties (6)
Counties that share a border with Austin County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 48015.
Federal Datasets Using Code 48015
FIPS code 48015 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 48015 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:015",
"in": "state:48",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Austin County, Texas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '48015';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '48'
AND county_fips = '015';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 48015 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "48",
county = "015",
year = 2022
)ZIP Codes in Austin 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 Austin County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 77418 | 100.0% |
| 78944 | 100.0% |
| 77473 | 100.0% |
| 78931 | 100.0% |
| 77474 | 98.1% |
| 78950 | 69.0% |
| 77485 | 59.9% |
| 78933 | 30.5% |
| 77426 | 21.4% |
| 77833 | 8.5% |
| 78954 | 8.3% |
| 78940 | 7.9% |
| 77835 | 1.1% |