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The land area of Washington, DC was 61 in 2015.

Land Area

Water Area

Land area is a measurement providing the size, in square miles, of the land portions of geographic entities for which the Census Bureau tabulates and disseminates data. Area is calculated from the specific boundary recorded for each entity in the Census Bureau's geographic database. Land area is based on current information in the TIGER® data base, calculated for use with Census 2010.

Water Area figures include inland, coastal, Great Lakes, and territorial sea water. Inland water consists of any lake, reservoir, pond, or similar body of water that is recorded in the Census Bureau's geographic database. It also includes any river, creek, canal, stream, or similar feature that is recorded in that database as a two- dimensional feature (rather than as a single line). The portions of the oceans and related large embayments (such as Chesapeake Bay and Puget Sound), the Gulf of Mexico, and the Caribbean Sea that belong to the United States and its territories are classified as coastal and territorial waters; the Great Lakes are treated as a separate water entity. Rivers and bays that empty into these bodies of water are treated as inland water from the point beyond which they are narrower than 1 nautical mile across. Identification of land and inland, coastal, territorial, and Great Lakes waters is for data presentation purposes only and does not necessarily reflect their legal definitions.

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

Geographic and Area Datasets Involving Washington, DC

  • API

    WAOFM - Congressional Districts - Table 1: Census 2010 Population and Housing

    data.wa.gov | Last Updated 2021-09-01T17:19:01.000Z

    Census 2010 population and housing for 2012 congressional districts based on Washington State Redistricting Commission plan C-JOINTSUB_2-1 as amended by Engrossed House Concurrent Resolution 4409.

  • API

    WAOFM - Census - Population and Housing, 2000 and 2010

    data.wa.gov | Last Updated 2021-09-01T17:20:31.000Z

    Population and housing information extracted from decennial census Public Law 94-171 redistricting summary files for Washington state for years 2000 and 2010.

  • API

    WAOFM - Legislative Districts - Table 1: Census 2010 Population and Housing

    data.wa.gov | Last Updated 2021-09-01T17:19:16.000Z

    Census 2010 population and housing for legislative districts based on Washington State Redistricting Commission plan L-JOINTSUB_3-2 as amended by Engrossed House Concurrent Resolution 4409.

  • API

    WAOFM - Census - Population Density by County by Decade, 1900 to 2020

    data.wa.gov | Last Updated 2023-07-06T16:48:57.000Z

    Washington state population density by county by decade 1900 to 2020.

  • API

    Annual Water Quality Index Score

    internal.open.piercecountywa.gov | Last Updated 2022-07-13T15:41:09.000Z

    2015 data source: https://data.wa.gov/Natural-Resources-Environment/Annual-2015-Water-Quality-Index-Data/u9d5-kb9m/data data source: https://data.wa.gov/Natural-Resources-Environment/Water-Quality-Index-Scores-1994-2013-from-The-WA-S/k5fe-2e4s/data

  • API

    Zip Codes

    fusioncenter.nhit.org | Last Updated 2024-02-16T12:40:53.000Z

    ZIP Code Shapefile provided by the District of Columbia, showing ZIP Codes.

  • API

    Demographic - Population Percent by Sex by County WA

    internal.open.piercecountywa.gov | Last Updated 2024-05-30T17:02:48.000Z

    Population estimates for percentage of males and females in an area.(DP05, variables: DP05_0001E, DP05_0002E, DP05_0003E). County and State values are from the ACS 1 Year Survey.

  • API

    Directory Of Unsheltered Street Homeless To General Population Ratio 2010

    data.cityofnewyork.us | Last Updated 2022-05-09T22:25:51.000Z

    "Ratio of Homeless Population to General Population in major US Cities in 2010. *This represents a list of large U.S. cities for which DHS was able to confirm a recent estimate of the unsheltered population. A 2010 result is only available for Seattle, WA. Other cities either did not conduct a count in 2010, or their 2010 results are not yet available. 2009 unsheltered census figures were used for Los Angeles, San Francisco, Miami, and Washington, DC, and Boston; the 2007 estimate is used for Chicago. General population figures are the latest estimates from the U.S. Census Bureau."

  • API

    Real Property Tax - 2016

    data.montgomerycountymd.gov | Last Updated 2023-06-27T19:27:56.000Z

    This data represents all of the County’s residential real estate properties and all of the associated tax charges and credits with that property processed at the annual billing in July of each year, excluding any subsequent billing additions and/or revisions throughout the year. This dataset excludes the names of the property owners. The addresses in this database represent the address of the property. For more information about the individual taxes and credits, please go to http://www.montgomerycountymd.gov/finance/taxes/faqs.html#credit. Update Frequency: Updated Annually in July

  • API

    Asotin County Library District Program Attendance

    data.wa.gov | Last Updated 2020-11-07T00:06:02.000Z

    This dataset reports annual attendance at Asotin County (WA) Library District programs. The library district reports the figures annually to the Public Libraries Survey, administered by the Washington State Library in cooperation with the U.S. Institute of Museum and Library Services. For a detailed glossary of terms and more information about the survey, visit the Statistics page at the Washington State Library: https://www.sos.wa.gov/library/libraries/libdev/publications.aspx#WAStats