St. Mary Parish
Louisiana · County seat: Franklin · Active county or equivalent
FIPS code 22101 is St. Mary Parish, Louisiana. With a population of 49,114 (2022 ACS estimate), it ranks #22 in Louisiana and #1013 nationally. St. Mary Parish is part of the Morgan City, 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
22101
Population
49,114
2022 ACS · #1013 nationally
Density
88.4/mi²
people per sq mile
Land Area
555
sq miles
Urban/Rural
Nonmetro — urban 20K+, adjacent to metro
RUCC 4
How This FIPS Code Works
The 5-digit FIPS code 22101 is formed by combining the 2-digit state identifier 22 (Louisiana) with the 3-digit county identifier 101. Together they uniquely identify St. Mary Parish in every US federal dataset. No two counties share the same 5-digit FIPS code.
Census ACS Data for FIPS 22101
From the 2022 ACS 5-year estimates — the same values you'd retrieve by querying the Census API with county FIPS 22101.
Median Household Income
$47,322
ACS B19013_001E
Poverty Rate
21.9%
ACS B17001 (below poverty level)
Median Age
39.5
ACS B01002_001E
Metropolitan Area
Adjacent Counties (4)
Counties that share a border with St. Mary Parish. Useful for regional analysis — these are the geographies you'd typically include when studying labor markets, commuting zones, or environmental spillovers around FIPS 22101.
Federal Datasets Using Code 22101
FIPS code 22101 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 22101 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:101",
"in": "state:22",
"key": "YOUR_CENSUS_API_KEY",
}
r = requests.get(url, params=params)
data = r.json() # [[header...], [St. Mary Parish, Louisiana, income, pop, ...]-- 5-digit combined FIPS (state + county)
SELECT * FROM your_table WHERE county_fips = '22101';
-- Some datasets store state and county separately
SELECT * FROM your_table
WHERE state_fips = '22'
AND county_fips = '101';
-- ⚠ Never cast to integer — leading zeros are lost:
-- county_fips = 22101 is WRONG for this countylibrary(tidycensus)
get_acs(
geography = "county",
variables = c(income = "B19013_001E", pop = "B01003_001E"),
state = "22",
county = "101",
year = 2022
)ZIP Codes in St. Mary 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. Mary Parish. Why FIPS ≠ ZIP →
| ZIP Code | % in county |
|---|---|
| 70340 | 100.0% |
| 70342 | 100.0% |
| 70523 | 100.0% |
| 70538 | 100.0% |
| 70392 | 100.0% |
| 70514 | 100.0% |
| 70522 | 100.0% |
| 70544 | 47.4% |
| 70380 | 32.5% |