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All St. Mary's County population data above are from the US Census Bureau.
The population data for St. Mary's County are from the Census' American Community Survey 2017 5-year estimates and the Census' 2018 Population Estimates. The demographic data for Cecil County, Harford County, Prince George's County, and Wicomico County are the most current, comparable demographics available from the US Census Bureau, are from the American Community Survey 2017 5-year estimates, and were downloaded on 6 December 2018. Check out our FAQ section for more details.
With 112,664 people, St. Mary's County is the 11th most populated county in the state of Maryland out of 23 counties. But watch out, St. Mary's County, because Cecil County with 102,826 people and Wicomico County with 103,195 people are right behind you.
The largest St. Mary's County racial/ethnic groups are White (75.1%) followed by Black (14.2%) and Hispanic (4.8%).
In 2017, the median household income of St. Mary's County residents was $86,508. St. Mary's County households made slightly more than Harford County households ($83,445) and Prince George's County households ($78,607) . However, 8.2% of St. Mary's County residents live in poverty.
The median age for St. Mary's County residents is 36.5 years young.
86% of people CANNOT find the data they're looking for on the US Census Bureau website. Source: Nielsen Norman Group
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