The land area of Fairfax County, VA was 391 in 2018.

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 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.

Geographic and Area Datasets Involving Fairfax County, VA

  • API

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  • API

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  • API

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  • API

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    Virginia Public WiFi Hotspots Shapefile | Last Updated 2021-03-01T14:35:05.000Z

    Shapefile contains VA Public Wifi Hotspots. Updated monthly

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    Iowa Fleet Summary By Year, County And Vehicle Type | Last Updated 2022-02-08T17:41:18.000Z

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    Iowa Unemployment Insurance Initial Claims by County (Monthly) | Last Updated 2022-07-11T16:47:23.000Z

    This dataset contains Iowa unemployment insurance initial claims by county. County data is based on the claimant’s place of residence. (2011 to date)

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    Federation of VA Food Banks - Blue Ridge Area Food Bank (BRAFB) | Last Updated 2021-10-01T18:39:40.000Z

    Blue Ridge Area Food Bank (BRAFB) donations and population served by Locality from January 2019 through June 2021 as reported by Federation of Virginia Food Banks

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    2019 US Census All Counties & County Equivalents | Last Updated 2022-01-13T19:43:05.000Z

    2019 US Census All Counties and County Equivalents geospatial data U.S. Census Bureau; TIGER/Line Shapefiles 2019 Data accessed from: TIGER/Line Shapefiles do not include demographic data, but they do contain geographic entity codes (GEOIDs) that can be linked to the Census Bureau’s demographic data. The Geographic Areas Reference Manual (GARM) describes in great detail the basic geographic entities the Census Bureau uses ( TIGER Data Products Guide (

  • API

    Iowa Medicaid Payments & Recipients by Month and County | Last Updated 2022-08-04T22:01:12.000Z

    This dataset contains aggregate Medicaid payments, and counts for eligible recipients and recipients served by month and county in Iowa, starting with month ending 1/31/2011. Eligibility groups are a category of people who meet certain common eligibility requirements. Some Medicaid eligibility groups cover additional services, such as nursing facility care and care received in the home. Others have higher income and resource limits, charge a premium, only pay the Medicare premium or cover only expenses also paid by Medicare, or require the recipient to pay a specific dollar amount of their medical expenses. Eligible Medicaid recipients may be considered medically needy if their medical costs are so high that they use up most of their income. Those considered medically needy are responsible for paying some of their medical expenses. This is called meeting a spend down. Then Medicaid would start to pay for the rest. Think of the spend down like a deductible that people pay as part of a private insurance plan.