FIPS code 48397 is Rockwall County, Texas. With a population of 110,631 (2022 ACS estimate), it ranks #40 in Texas and #551 nationally. Rockwall County is part of the Dallas-Fort Worth-Arlington, 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
48397
Population
110,631
2022 ACS · #551 nationally
Density
870.8/mi²
people per sq mile
Land Area
127
sq miles
Urban/Rural
Metro — 1M+ population
RUCC 1
How This FIPS Code Works
The 5-digit FIPS code 48397 is formed by combining the 2-digit state identifier 48 (Texas) with the 3-digit county identifier 397. Together they uniquely identify Rockwall County in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 48397
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 48397.
Median Household Income
$121,303
ACS B19013_001E
Poverty Rate
4.2%
ACS B17001 (below poverty level)
Median Age
37.6
ACS B01002_001E
Metropolitan Area
Adjacent Counties (4)
Counties that share a border with Rockwall County. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 48397.
Federal Datasets Using Code 48397
FIPS code 48397 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 48397 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:397",
"in": "state:48",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [Rockwall County, Texas, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '48397';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '48'
AND county_fips = '397';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 48397 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "48",
county = "397",
year = 2022
)ZIP Codes in Rockwall 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 Rockwall County. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 75132 | 100.0% |
| 75032 | 100.0% |
| 75087 | 93.7% |
| 75189 | 42.3% |
| 75088 | 12.7% |
| 75089 | 3.7% |
| 75098 | 3.0% |
| 75126 | 2.6% |
| 75160 | 0.1% |