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Where am ILOCATED

St. Mary's County, Maryland

St. Mary's County, Maryland, has 116,692 residents (July 2025 estimate). Its county seat is Leonardtown. It uses Eastern Time and covers 359 sq mi (929 km²) of land.

BaltimoreColumbia
St. Mary's County in Maryland
Charles CountyDorchester CountySomerset CountyWestmoreland CountyLexington ParkCaliforniaWildewoodGolden Beach
St. Mary's County and its neighbors (simplified outlines). Open in OpenStreetMap ↗
Resident population, July 2025
116,692
Land area
359 sq mi (929 km²)
County seat or government
Leonardtown
Time zone
Eastern TimeUTC-05:00 in January; UTC-04:00 in July
Median household income
$119,446 ± $4,480
Median home value
$407,600 ± $8,365
Median rent, with utilities
$1,747 ± $60
Homes lived in by their owners
73.2% ± 1.7 points
County type
County
Metro or micro area
Lexington Park, MD metro areaCentral county
Water area
406 sq mi (1,051 km²)
State
Maryland
County code (FIPS)
24037
Coordinates (central point)
38.223077, -76.534487
Open this point in the location finder

These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.

Time zones in St. Mary's County

Time zoneLocal time and UTC offsetNext clock change
Eastern TimeAmerica/New_YorkUTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock.Enable JavaScript for upcoming changes.

Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.

ZIP Code areas, largest first

  1. 2065326,852 people
  2. 2065924,324 people
  3. 2065016,094 people
  4. 2061914,212 people
  5. 2063610,486 people
  6. 206347,088 people
  7. 206225,185 people
  8. 206702,046 people
  9. 206181,705 people
  10. 206201,115 people
  11. 206901,077 people
  12. 20686971 people
All 27
  1. 20621958 people
  2. 20684802 people
  3. 20624796 people
  4. 20674769 people
  5. 20609714 people
  6. 20680663 people
  7. 20630559 people
  8. 20692505 people
  9. 20628503 people
  10. 20687415 people
  11. 20606291 people
  12. 20626284 people
  13. 20667150 people
  14. 2065687 people
  15. 2066014 people

27 ZIP Code areas overlap St. Mary's County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.

Official county information

We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.

Election districts in St. Mary's County, largest first

  1. District 8, Bay42,255 people
  2. District 3, Leonardtown18,826 people
  3. District 5, Mechanicsville13,077 people
  4. District 6, Patuxent12,883 people
  5. District 4, Chaptico10,362 people
  6. District 2, Valley Lee7,263 people
  7. District 1, St. Inigoes6,979 people
  8. District 7, Milestown3,204 people
  9. District 9, St. George Island277 people

People counts are American Community Survey 2020–2024 5-year estimates. All election districts in Maryland, by county

School districts in St. Mary's County, largest first

  1. St. Marys County Public Schools115,126 people

Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.

Cities, towns and communities, largest first

These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.

  1. Lexington Park, Maryland (CDP)13,252 people
  2. California, Maryland (CDP)13,136 people
  3. Wildewood, Maryland (CDP)7,552 people
  4. Leonardtown, Maryland (town)4,808 people
  5. Golden Beach, Maryland (CDP)3,830 people
  6. Mechanicsville, Maryland (CDP)1,395 people
  7. Piney Point, Maryland (CDP)1,274 people
  8. Charlotte Hall, Maryland (CDP)1,172 people
  9. Callaway, Maryland (CDP)930 people
  10. Tall Timbers, Maryland (CDP)391 people
  11. St. George Island, Maryland (CDP)277 people

Bordering areas, nearest first

Distances are straight lines between map points.

  1. Westmoreland County, Virginia17 mi southwest
  2. Calvert County, Maryland21 mi north
  3. Northumberland County, Virginia27 mi south
  4. Dorchester County, Maryland30 mi northeast
  5. Charles County, Maryland31 mi northwest
  6. Somerset County, Maryland38 mi east

Before using this answer on a form

Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.

Find the county where you are now, check its ZIP area, or check the time zone where you are.

See this county on Census.gov ↗

Areas that only touch the edge

These areas meet the boundary only along a sliver. Most addresses here are not in them; for an address near the line, check with the county.