St. Mary's County, Maryland
St. Mary's County is a county in Maryland. Its county FIPS code is 24037. Use the boundary map and neighboring areas below to check the jurisdiction you need.
- Official code
- 24037
- Representative coordinates
- 38.223077, -76.534487
- County type
- County
- County seat or government
- Leonardtown
- Resident population, July 2025
- 116,692
- Land area
- 928.74 km²
- Water area
- 1,050.662 km²
- State
- Maryland
The representative point identifies this area. It is not a street address or a boundary survey.
Time zones in St. Mary's County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| America/New_York | UTC-05:00 in January; UTC-04:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Listed zones overlap the mapped area. A point lookup can distinguish sides of a boundary. Your device’s zone may differ.
Census ZIP areas
20606 · 20609 · 20618 · 20619 · 20620 · 20621 · 20622 · 20624 · 20626 · 20628 · 20630 · 20634 · 20636 · 20650 · 20653 · 20656 · 20659 · 20660 · 20667 · 20670 · 20674 · 20680 · 20684 · 20686 · 20687 · 20690 · 20692
These statistical areas overlap the boundary. They are not delivery assignments; confirm mailing details with USPS ZIP Code Lookup.
Official county information
Use the US government local-office directory ↗ to find the office responsible for your address. A county website has not been confidently matched here. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Cities, towns and communities
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
Areas sharing the mapped boundary
These areas touch this mapped boundary.
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 at your current point, check its ZIP area, or find its physical time zone.