St. Mary's
Source:
Maryland
St. Mary's is a mid-size county in Maryland with 25 ZIP codes, 103,749 people, and top-decile household income among US counties. All data is sourced from the U.S. Census Bureau American Community Survey (ACS) 2023 5-Year Estimates.
National county placement
According to ACS 5-Year Estimates, St. Mary's, MD sits among US counties with a top-decile household income, on a mid-size county population base, across a multi-ZIP patchwork.
- Top 1%
- household income vs 3,210 US counties
- 103,749
- combined ZIP population
- 25
- USPS ZIP codes covered
- $138,384
- avg ZIP median income
Income percentile ranks this county's average ZIP median household income against 3,210 US counties with ACS income on at least one ZIP.
St. Mary's lands in the national county income distribution as top-decile household income on mid-size county footing (FIPS 24037, 25 ZIPs, combined population 103,749). Sort the ZIP table by population before treating the county mean as uniform.
High-income counties with wide ZIP mosaics hide sharp internal gradients. The densest ZIP here is 20653 (Lexington Park) with 24,481 residents - open it beside a thin rural code from the table before treating the county mean as uniform. HUD Fair Market Rents and FBI county tables attach to FIPS 24037, so scorecards stay county-keyed while household income stays ZIP-keyed.
Save two ZIPs from the table into your shortlist, then open a compare link - that is the return path a static county summary cannot replace. All figures here come from Census ACS 2023 5-Year Estimates and USPS ZCTA files.
25
Total ZIPs
103,749
Total Population
ZIP Codes in St. Mary's
Side-by-side: Compare 20653 vs 20659 →
| ZIP Code | City | Population | Density |
|---|---|---|---|
| 20653 | Lexington Park | 24,481 | 289 |
| 20659 | Mechanicsville | 23,498 | 97 |
| 20650 | Leonardtown | 13,717 | 87 |
| 20619 | California | 10,503 | 259 |
| 20636 | Hollywood | 9,937 | 104 |
| 20634 | Great Mills | 5,927 | 333 |
| 20620 | Callaway | 1,443 | 144 |
| 20621 | Chaptico | 1,373 | 38 |
| 20686 | Saint Marys City | 1,332 | 475 |
| 20624 | Clements | 1,282 | 39 |
| 20684 | Saint Inigoes | 1,125 | 48 |
| 20609 | Avenue | 1,120 | 43 |
| 20680 | Ridge | 1,119 | 70 |
| 20692 | Valley Lee | 1,051 | 47 |
| 20670 | Patuxent River | 1,014 | 42 |
| 20674 | Piney Point | 830 | 152 |
| 20690 | Tall Timbers | 740 | 158 |
| 20618 | Bushwood | 607 | 42 |
| 20628 | Dameron | 594 | 35 |
| 20667 | Park Hall | 494 | 95 |
| 20606 | Abell | 431 | 57 |
| 20626 | Coltons Point | 373 | 119 |
| 20630 | Drayden | 348 | 24 |
| 20687 | Scotland | 313 | 20 |
| 20660 | Morganza | 97 | 41 |
Frequently Asked Questions
What is the population of St. Mary's?
St. Mary's has a total population of 103,749 across 25 ZIP codes, based on U.S. Census Bureau ACS 2023 data.
What ZIP codes are in St. Mary's?
St. Mary's includes 25 ZIP codes: 20653, 20659, 20650, 20619, 20636, 20634, 20620, 20621, 20686, 20624, and more.