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The land area of Fairfax County, VA was 391 in 2018. The land area of Loudoun County, VA was 516 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 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 Loudoun County, VA or Fairfax County, VA

  • API

    Iowa Unemployment Insurance Initial Claims by County (Monthly)

    mydata.iowa.gov | Last Updated 2024-05-14T19:53:23.000Z

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

  • API

    Iowa Medicaid Payments & Recipients by Month and County

    mydata.iowa.gov | Last Updated 2024-05-28T22:00:25.000Z

    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.

  • API

    Iowa Fleet Summary By Year, County And Vehicle Type

    mydata.iowa.gov | Last Updated 2024-02-02T16:28:41.000Z

    The dataset provides vehicle (both motor vehicle and trailer) registration numbers and annual fees in Iowa by year, county and vehicle types. Vehicle types include: Autocycle, Automobile, Bus, Moped, Motor Home - A, Motor Home - B, Motor Home - C, Motorcycle, Multi-purpose, Regular Trailer, Semi Trailer, Small Regular Trailer, Small Semi Trailer, Truck Tractor, Travel Trailer, Truck, Truck - Business Trade, and Truck - Weight and List.

  • API

    Advanced Messaging Concept Development Basic Mobility Control Message

    datahub.transportation.gov | Last Updated 2024-05-13T17:15:48.000Z

    Contains all Basic Mobility Control Message (BMCMs) generated during the Advanced Messaging Concept Development (AMCD) field testing program. While there is no specific standard in existence that addresses the content of a BMCM, the following format was derived to control the configuration and content of BMMs requested from the vehicle. All BMCMs are generated by the VCC Cloud server and transmitted to OBU clients through either a DSRC or cellular communications channel.

  • API

    Iowa Townships

    mydata.iowa.gov | Last Updated 2023-08-30T17:29:32.000Z

    This dataset contains a listing of townships within the Iowa including the GNIS code, county name, township name, and primary point (location) for the township.

  • API

    Primary Points for Iowa Counties

    mydata.iowa.gov | Last Updated 2023-10-16T20:35:30.000Z

    This dataset contains the primary points for Iowa Counties. Primary points are generally at or near the geographic center of the county.

  • API

    Iowa Geographic Names

    mydata.iowa.gov | Last Updated 2024-05-17T22:00:20.000Z

    This dataset provides the geographic names data for Iowa. All names data products are extracted from the Geographic Names Information System (GNIS), the Federal Government's repository of official geographic names. The GNIS contains the federally recognized name of each feature and defines its location by State, county, USGS topographic map, and geographic coordinates. GNIS also lists variant names, which are non-official names by which a feature is or was known. Other attributes include unique Feature ID and feature class. Feature classes under the purview of the U.S. Board on Geographic Names include natural features, unincorporated populated places, canals, channels, reservoirs, and more.

  • API

    DWR Dam Safety Jurisdictional Dam

    data.colorado.gov | Last Updated 2024-05-29T06:55:14.000Z

    A Jurisdictional Dam is a dam creating a reservoir with a capacity of more than 100 acre-feet, or creates a reservoir with a surface area in excess of 20 acres at the high-water line, or exceeds 10 feet in height measured vertically from the elevation of the lowest point of the natural surface of the ground where that point occurs along the longitudinal centerline of the dam up to the crest of the emergency spillway of the dam. For reservoirs created by excavation, or where the invert of the outlet conduit is placed below the surface of the natural ground at its lowest point beneath the dam, the jurisdictional height shall be measured from the invert of the outlet at the longitudinal centerline of the embankment or from the bottom of the excavation at the longitudinal centerline of the dam, whichever is greatest. Jurisdictional height is defined in Rule 4.2.19. The State Engineer shall have final authority over determination of the jurisdictional height of the dam.

  • API

    National Incorporated Places and Counties

    mydata.iowa.gov | Last Updated 2023-08-30T17:36:07.000Z

    This dataset contains a listing of incorporated places (cities and towns) and counties within the United States including the GNIS code, FIPS code, name, entity type and primary point (location) for the entity. The types of entities listed in this dataset are based on codes provided by the U.S. Census Bureau, and include the following: 1. C1 - An active incorporated place that does not serve as a county subdivision equivalent; 2. C2 - An active incorporated place legally coextensive with a county subdivision but treated as independent of any county subdivision; 3. C3 - A consolidated city; 4. C4 - An active incorporated place with an alternate official common name; 5. C5 - An active incorporated place that is independent of any county subdivision and serves as a county subdivision equivalent; 6. C6 - An active incorporated place that partially is independent of any county subdivision and serves as a county subdivision equivalent or partially coextensive with a county subdivision but treated as independent of any county subdivision; 7. C7 - An incorporated place that is independent of any county; 8. C8 - The balance of a consolidated city excluding the separately incorporated place(s) within that consolidated government; 9. C9 - An inactive or nonfunctioning incorporated place; 10. H1 - An active county or statistically equivalent entity; 11. H4 - A legally defined inactive or nonfunctioning county or statistically equivalent entity; 12. H5 - A census areas in Alaska, a statistical county equivalent entity; and 13. H6 - A county or statistically equivalent entity that is areally coextensive or governmentally consolidated with an incorporated place, part of an incorporated place, or a consolidated city.

  • API

    County

    data.bayareametro.gov | Last Updated 2023-12-17T07:11:49.000Z

    County