County ProfileLA
St. Mary County
Population: 49,406 · 9 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
49,406
People
Median age
39.7
Housing
Total households
18,463
Income
Median household income
$52,576
Housing
Total housing units
22,507
Employment
Employment rate
51.2%
Education
Bachelor’s degree or higher
13.6%
Healthcare
Insured population
91.5%
County details
Local time 02:28:06(CT)| Name | St. Mary |
|---|---|
| Total ZIP codes | 9total |
| ZIP codes (by type) | 5 Standard4 PO Box |
| Area code | 337, 985 |
| Timezone | Central Time (CT) |
| Coordinates | 29.6293488, -91.4638037 |
| Land area | 558.5 sq miles(1,446.6 km²) |
Map of St. Mary county, Louisiana with ZIP codes
Cities and Communities in St. Mary County
Compare the largest cities in St. Mary County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
| City | Population | Median incomeHousehold | ZIP codes |
|---|---|---|---|
| Morgan City | 11,472 | $56,474 | 2ZIPs |
| Franklin | 6,728 | $39,518 | 1ZIPs |
| Patterson | 5,931 | $49,886 | 1ZIPs |
| Berwick | 4,771 | $51,580 | 1ZIPs |
| Amelia | 2,132 | $55,472 | 1ZIPs |
| Baldwin | 1,762 | $31,669 | 1ZIPs |
| Charenton | 1,699 | $63,463 | 1ZIPs |
| Centerville | 499 | $74,509 | 1ZIPs |
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in St. Mary County
Review the most populated postal areas across St. Mary County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS