County ProfileMD
St. Mary's County
Population: 113,777 · 27 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
113,777
People
Median age
37.2
Housing
Total households
42,436
Income
Median household income
$119,446
Housing
Total housing units
46,385
Employment
Employment rate
62.9%
Education
Bachelor’s degree or higher
36.5%
Healthcare
Insured population
96.1%
County details
Local time 05:35:48(ET)| Name | St. Mary's |
|---|---|
| Total ZIP codes | 27total |
| ZIP codes (by type) | 25 Standard2 PO Box |
| Area code | 227, 240, 301 |
| Timezone | Eastern Time (ET) |
| Coordinates | 38.2230765, -76.534487 |
| Land area | 358.6 sq miles(928.7 km²) |
Map of St. Mary's county, Maryland with ZIP codes
Cities and Communities in St. Mary's County
Compare the largest cities in St. Mary's 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 |
|---|---|---|---|
| Lexington Park | 13,317 | $94,799 | 1ZIPs |
| California | 12,947 | $119,855 | 1ZIPs |
| Hollywood | 10,615 | — | 1ZIPs |
| Great Mills | 6,984 | — | 1ZIPs |
| Leonardtown | 4,563 | $153,819 | 1ZIPs |
| Callaway | 1,779 | $160,341 | 1ZIPs |
| Mechanicsville | 1,673 | $120,966 | 1ZIPs |
| Charlotte Hall | 1,388 | $84,271 | 1ZIPs |
| Patuxent River | 1,226 | — | 1ZIPs |
| Chaptico | 1,214 | — | 1ZIPs |
| Saint Inigoes | 1,193 | — | 1ZIPs |
| Clements | 1,138 | — | 1ZIPs |
| Avenue | 1,076 | — | 1ZIPs |
| Bushwood | 1,073 | — | 1ZIPs |
| Piney Point | 980 | $129,018 | 1ZIPs |
| Saint Marys City | 977 | — | 1ZIPs |
| Ridge | 944 | — | 1ZIPs |
| Valley Lee | 738 | — | 1ZIPs |
| Dameron | 599 | — | 1ZIPs |
| Drayden | 586 | — | 1ZIPs |
| Park Hall | 471 | — | 1ZIPs |
| Tall Timbers | 451 | $195,982 | 1ZIPs |
| Coltons Point | 403 | — | 1ZIPs |
| Scotland | 304 | — | 1ZIPs |
| Abell | 251 | — | 1ZIPs |
| Morganza | 107 | — | 1ZIPs |
| Loveville | 106 | — | 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's County
Review the most populated postal areas across St. Mary's County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
| ZIP | City | Median incomeHousehold | Population (ZIP) |
|---|---|---|---|
| 20653 | Lexington Park | $103,048 | 25,180 |
| 20659 | Mechanicsville | $121,654 | 24,427 |
| 20650 | Leonardtown | $143,116 | 15,298 |
| 20619 | California | $119,432 | 14,179 |
| 20636 | Hollywood | $163,690 | 10,615 |
| 20634 | Great Mills | $139,375 | 6,984 |
| 20622 | Charlotte Hall | $124,063 | 4,741 |
| 20620 | Callaway | $165,972 | 1,588 |
| 20670 | Patuxent River | $70,371 | 1,226 |
| 20621 | Chaptico | — | 1,214 |
| 20684 | Saint Inigoes | $180,060 | 1,193 |
| 20624 | Clements | $104,545 | 1,138 |
| 20609 | Avenue | $118,102 | 1,076 |
| 20618 | Bushwood | $105,508 | 1,073 |
| 20686 | Saint Marys City | — | 977 |
| 20690 | Tall Timbers | $122,750 | 954 |
| 20680 | Ridge | — | 944 |
| 20692 | Valley Lee | $201,250 | 738 |
| 20674 | Piney Point | $171,985 | 718 |
| 20628 | Dameron | — | 599 |
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