St. Martin Parish
Louisiana · County seat: St. Martinville · Active county or equivalent
FIPS code 22099 is St. Martin Parish, Louisiana. With a population of 51,856 (2022 ACS estimate), it ranks #21 in Louisiana and #971 nationally. St. Martin Parish is part of the Lafayette, 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
22099
Population
51,856
2022 ACS · #971 nationally
Density
70.3/mi²
people per sq mile
Land Area
738
sq miles
Urban/Rural
Metro — 250K–1M population
RUCC 2
How This FIPS Code Works
The 5-digit FIPS code 22099 is formed by combining the 2-digit state identifier 22 (Louisiana) with the 3-digit county identifier 099. Together they uniquely identify St. Martin Parish in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 22099
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 22099.
Median Household Income
$50,806
ACS B19013_001E
Poverty Rate
17.6%
ACS B17001 (below poverty level)
Median Age
39.5
ACS B01002_001E
Metropolitan Area
Adjacent Counties (7)
Counties that share a border with St. Martin Parish. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 22099.
Federal Datasets Using Code 22099
FIPS code 22099 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 22099 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:099",
"in": "state:22",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [St. Martin Parish, Louisiana, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '22099';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '22'
AND county_fips = '099';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 22099 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "22",
county = "099",
year = 2022
)ZIP Codes in St. Martin 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 St. Martin Parish. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 70519 | 100.0% |
| 70517 | 98.9% |
| 70582 | 94.4% |
| 70518 | 45.5% |
| 70512 | 39.0% |
| 70380 | 28.5% |
| 70339 | 13.0% |
| 70560 | 1.0% |