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The population count of St. Mary's County, MD was 111,531 in 2018.

Population

Population Change

Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API - Notes:

1. ODN datasets and APIs are subject to change and may differ in format from the original source data in order to provide a user-friendly experience on this site.

2. To build your own apps using this data, see the ODN Dataset and API links.

3. If you use this derived data in an app, we ask that you provide a link somewhere in your applications to the Open Data Network with a citation that states: "Data for this application was provided by the Open Data Network" where "Open Data Network" links to http://opendatanetwork.com. Where an application has a region specific module, we ask that you add an additional line that states: "Data about REGIONX was provided by the Open Data Network." where REGIONX is an HREF with a name for a geographical region like "Seattle, WA" and the link points to this page URL, e.g. http://opendatanetwork.com/region/1600000US5363000/Seattle_WA

Demographics and Population Datasets Involving St. Mary's County, MD

  • API

    Maryland Resident Population Per Square Mile: 2010-2020

    opendata.maryland.gov | Last Updated 2022-04-08T18:59:46.000Z

    Resident population density for Maryland and Jurisdictions per square mile from 2010 to 2020. Source: U.S. Bureau of Census

  • API

    Maryland Total Change in Resident Population: 2020-2021

    opendata.maryland.gov | Last Updated 2022-10-12T19:33:39.000Z

    Total Change in Resident Population in Maryland and its Jurisdictions by year from July 1, 2020 to July 1, 2021.

  • API

    Maryland Median Household Income By Year With Margin Of Error: 2010-2020

    opendata.maryland.gov | Last Updated 2022-10-07T20:48:17.000Z

    The data consist of the median household income by the year in Maryland and the margin of error of the median income from 2010-2020. MOE= Margin of Error for the 90% confidence interval. Source from the U.S. Census Bureau, Small Area Income and Poverty Estimates, May 2021.

  • API

    Population Estimates 2010-2021

    opendata.maryland.gov | Last Updated 2022-11-08T00:19:24.000Z

    Maryland Total Resident Population from 2010 - 2021 based on US Census Data

  • API

    Maryland Domestic Migration: 2010-2021

    opendata.maryland.gov | Last Updated 2022-09-29T21:33:58.000Z

    Domestic Migration in Maryland and its Jurisdictions from 2010 to 2021. Domestic migration will also include the net change in group quarters population. Source: Population Division, U.S. Census bureau, May 2021.

  • API

    Maryland International Migration: 2001-2021

    opendata.maryland.gov | Last Updated 2022-10-03T21:16:24.000Z

    Maryland International Migration from 2001 to 2021, which includes net foreign-born international migration, net movement to/ from Puerto Rico, net Armed Forces movement and native emigration. Source from the Population Division, U.S. Census Bureau, March 2022.

  • API

    Maryland Total Migration: 2000-2021

    opendata.maryland.gov | Last Updated 2022-10-03T20:23:48.000Z

    Maryland Total (International and Domestic) Migration from 2000 to 2020. Source from the Population Division, U.S. Census Bureau.

  • API

    MD COVID-19 - Confirmed Deaths by County

    opendata.maryland.gov | Last Updated 2023-09-26T14:46:29.000Z

    <b>Note:</b> Starting April 27, 2023 updates change from daily to weekly. <b>Summary</b> The cumulative number of confirmed COVID-19 deaths among Maryland residents within a single Maryland jurisdiction. <b>Description</b> The MD COVID-19 - Confirmed Deaths by County data layer is a collection of the statewide confirmed COVID-19 related deaths that have been reported each day by the Vital Statistics Administration that have occurred in each Maryland jurisdiction. A death is classified as confirmed if the person had a laboratory-confirmed positive COVID-19 test result. Some data on deaths may be unavailable due to the time lag between the death, typically reported by a hospital or other facility, and the submission of the complete death certificate. This data layer does not include probable deaths. Probable deaths are available from the MD COVID-19 - Probable Deaths by County data layer. <b>Terms of Use</b> The Spatial Data, and the information therein, (collectively the "Data") is provided "as is" without warranty of any kind, either expressed, implied, or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct, indirect, incidental, consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data, nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.

  • API

    Prevalence and Mean of Dental Caries (Cavities) among Maryland School Children, 2005-2006

    opendata.maryland.gov | Last Updated 2018-04-06T13:25:19.000Z

    This is the weighted prevalence of 1,276 schoolchildren. 1,276 out of 1,280 cases examined had prevalence available. One out of 1,276 cases had grade information missed, 564 were in Kindergarten and 711 in 3rd grade. Prevalence is defined as occurrence of any caries among all selected population. Mean is the average number of teeth with caries among students with caries in the selected population. Region Identifiers and Constituent Counties: Western (Allegany, Frederick, Garrett, Washington); Central D.C. (Howard, Montgomery, Prince George’s); Southern (Calvert, Charles, St. Mary’s); Central Baltimore (Anne Arundel, Baltimore City, Baltimore County, Carroll, Harford); Eastern Shore (Caroline, Cecil, Dorchester, Kent, Queen Anne’s, Somerset, Talbot, Wicomico, Worcester).

  • API

    Prevalence of Children with No Caries, Sealant or Restorations in Maryland School Children, 2005-2006

    opendata.maryland.gov | Last Updated 2018-04-06T13:24:39.000Z

    This is the weighted prevalence of 1,276 schoolchildren. 1,276 out of 1,280 cases examined had prevalence available. One out of 1,276 cases had grade information missed, 564 were in Kindergarten and 711 in 3rd grade. Prevalence is defined as occurrence of no caries, sealants, or restorations among all selected population. Region Identifiers and Constituent Counties: Western (Allegany, Frederick, Garrett, Washington); Central D.C. (Howard, Montgomery, Prince George’s); Southern (Calvert, Charles, St. Mary’s); Central Baltimore (Anne Arundel, Baltimore City, Baltimore County, Carroll, Harford); Eastern Shore (Caroline, Cecil, Dorchester, Kent, Queen Anne’s, Somerset, Talbot, Wicomico, Worcester).