Saint Mary s County (Saint Mary's County), Maryland
Saint Mary s County: county in Maryland, United States
About
Saint Mary's County is a county located in the U.S. state of Maryland. As of the 2010 census, the population was 105,151 and a population density of 66 people per km². After 10 years in 2020 county had an estimated population of 114,687 inhabitants. Its county seat is Leonardtown. The county was created 389 years ago in 1636.
County Snapshot
Saint Mary's County at a glance
Saint Mary's County currently has 4 quality-checked populated place pages linked on MapSof, making it easier to jump from the county overview into local city pages.
Mapped populated places
4
These counts use a stricter populated-place filter so the main lists stay focused on real city and town pages.
Maryland counties
24
Open related pagesLargest city
Lexington ParkPopulation 11,626
Top linked places
Quick Facts about Saint Mary's County
| Population | 114,687 (2020) |
| Country | United States of America |
| State | Maryland (United States) |
| Different from | St. Mary Parish |
| Area | 1582 km2 |
| Water as percent of area | 53% |
| Land as percent of area | 47% |
| Latitude & Longitude | 38.2159,-76.5291 |
| Named for | Virgin Mary |
| Altitude | 112 feet / 34 meters |
| Capital | Leonardtown |
| Establishment | January 01, 1637 |
| Time Zone | America/New_York |
| Local time | 20:40:05 (18th April 2026) |
| Density | 72 Pop. per km² as of 2020 |
| Population growth | 8.31% (2010-2020) |
Geography
Saint Mary's County is located at 38°12'57"N 76°31'45"W (38.2158600, -76.5290600). It has 6 neighbors: Calvert County, Charles County, Dorchester County, Somerset County, Northumberland County and Westmoreland County.
Saint Mary s County map
icon to open full mode. View satellite images
The largest city of Saint Mary's County is Leonardtown with a population of 3,912. Other cities include and Golden Beach population 3,796. See all Saint Mary's County cities & populated places.
Saint Mary's County Populated Places
Cities, towns, neighborhoods & other populated places in Saint Mary's County.
| City Name | Population | Title |
|---|---|---|
| Lexington Park | 11,626 | Census designated place |
| Leonardtown | 3,912 | Town in Maryland, United States |
| Golden Beach | 3,796 | Town of the United States |
| Charlotte Hall | 1,420 | Census designated place |
Official website of Saint Mary's County
Official WebsiteDemographics
The population of Saint Mary's County increased by 8.31% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 105,151 | - | census |
| 2011 | 107,566 | 2.25% | estimation process |
| 2012 | 108,800 | 1.13% | estimation process |
| 2013 | 109,224 | 0.39% | estimation process |
| 2014 | 109,913 | 0.63% | estimation process |
| 2015 | 110,985 | 0.97% | estimation process |
| 2016 | 111,750 | 0.68% | estimation process |
| 2017 | 112,487 | 0.66% | estimation process |
| 2018 | 112,720 | 0.21% | estimation process |
| 2019 | 113,510 | 0.7% | estimation process |
| 2020 | 114,687 | 1.03% | estimation process |
People born in Saint Mary's County (17)
People born in Saint Mary's County, including Catholic bishop Edward Fenwick, politician Philip Key, politician Raphael Neale, .
More notable people
- John Causin (American politician (1811-1861)) he was born in 01/01/1811
- Bennett C. Riley (United States Army general and politician (1790-1853)) he was born in 01/01/1790
- Uriah Forrest (American politician, mayor of Georgetown (1746-1805)) he was born in 01/01/1746
- James Thomas (American politician (1785-1845)) he was born in 11/03/1785
- Robert Gilmor Jr. (shipowner and art collector (1774–1848)) he was born in 24/09/1774
- George Cooke (American painter (1793-1849)) he was born in 17/03/1793
- Charles Henry Wharton (President of Columbia University) he was born in 05/06/1748
- James H. Harris (United States Army Medal of Honor recipient) he was born in 01/01/1828
- John L. Bohanan, Jr. (American politician) he was born in 12/09/1958
- Richard Henry Alvey (United States federal judge) he was born in 06/03/1826
- William H. Barnes (United States Army Medal of Honor recipients) he was born in 01/01/1840
- William K. Bond (American politician) he was born in 02/10/1792
- Mary Kittamaquund (Piscataway diplomat) she was born in 01/01/1601
- Enoch Fenwick (American Jesuit priest) he was born in 15/05/1780
Maryland Other Counties (more counties)
| County Name | Population | Title |
|---|---|---|
| Essex | 1,832,752 | This Baltimore County community is situated at an elevation of 39 feet. |
| Montgomery County | 1,051,816 | County in Maryland, United States |
| Prince George's County | 909,612 | County in Maryland, United States |
| Baltimore County | 826,017 | County in Maryland, United States |
| City of Baltimore | 621,849 | Independent city in Maryland, United States |
| Baltimore | 586,131 | The thirty-first most populous city in the United States and the center of the Baltimore metropolitan area. |
| Anne Arundel County | 582,777 | County in Maryland, United States |
| Howard County | 328,200 | County in Maryland, United States |
| Frederick County | 265,161 | County in Maryland, United States |
| Harford County | 256,805 | County in Maryland, United States |
| Carroll County | 169,092 | County in New Hampshire, United States |
| Charles County | 164,436 | County in Maryland, United States |
| Washington County | 151,146 | County in Maryland, United States |
| Redland | 147,010 | A census-designated place in Prince George's County, Maryland. |
| Wicomico County | 103,990 | County in Maryland, United States |
| Cecil County | 103,419 | County in Maryland, United States |