West Baton Rouge Parish
Louisiana · County seat: Port Allen · Active county or equivalent
FIPS code 22121 is West Baton Rouge Parish, Louisiana. With a population of 27,377 (2022 ACS estimate), it ranks #35 in Louisiana and #1555 nationally. West Baton Rouge Parish is part of the Baton Rouge, LA. The state FIPS code for Louisiana is 22. This code is used in Census Bureau, BLS, EPA, HUD, and USDA federal datasets to identify this county.
County FIPS
22121
Population
27,377
2022 ACS · #1555 nationally
Density
142.3/mi²
people per sq mile
Land Area
192
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 22121 is formed by combining the 2-digit state identifier 22 (Louisiana) with the 3-digit county identifier 121. Together they uniquely identify West Baton Rouge Parish in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 22121
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 22121.
Median Household Income
$80,510
ACS B19013_001E
Poverty Rate
14.8%
ACS B17001 (below poverty level)
Median Age
36.4
ACS B01002_001E
Metropolitan Area
Adjacent Counties (5)
Counties that share a border with West Baton Rouge Parish. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 22121.
Federal Datasets Using Code 22121
FIPS code 22121 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 22121 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:121",
"in": "state:22",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [West Baton Rouge Parish, Louisiana, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '22121';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '22'
AND county_fips = '121';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 22121 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "22",
county = "121",
year = 2022
)ZIP Codes in West Baton Rouge Parish
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 West Baton Rouge Parish. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 70710 | 100.0% |
| 70719 | 100.0% |
| 70767 | 95.9% |
| 70729 | 75.8% |
| 70764 | 4.9% |