The land area of Baltimore County, MD was 598 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.

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Geographic and Area Datasets Involving Baltimore County, MD

  • API

    MDTA Accidents | Last Updated 2020-04-06T09:47:17.000Z

    Includes accidents that occured on MD Transportation Authority (MDTA) facilities, or were within a concurrent jurisdiction and were responded to by MDTA Police. MDTA facilities are the Francis Scott Key Bridge (I-695), John F. Kennedy Memorial Highway (I-95), Thomas J. Hatem Memorial Bridge (US 40), Fort McHenry Tunnel (I-95), Baltimore Harbor Tunnel (I-895), the Bay Bridge (US 50/301), Governor Harry W. Nice Memorial Bridge (US 301), and Intercounty Connector (ICC/MD200). MDTA Police are also responsible for accidents at BWI Airport and the Port of Baltimore. This dataset will be updated monthly by the MD Transportation Authority

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    MVA Electric and Hybrid Vehicle Registrations by County as of April 2020 | Last Updated 2020-05-15T21:23:05.000Z

    Total number of electric and hybrid vehicles with active MD registrations by county as of April 2020

  • API

    Building, Electrical, Fire, Grading, Mechanical, Plumbing & Sign Permits: 2010 - Present | Last Updated 2019-12-12T16:57:41.000Z

    Issued Permits: 01/01/2010 - Present

  • API

    Howard County Police Department Call For Service - 2014-2019 | Last Updated 2020-02-21T20:26:05.000Z

    Calls for Service by computer aided dispatch (CAD) event type, date, time, location, statistical reporting area (SRA), and beat.

  • API

    Maryland Median Household Income By Year With Margin Of Error: 2007-2016 | Last Updated 2019-09-20T11:52:27.000Z

    The data consist of the median household income by the year in Maryland and the margin of error of the median income from 2007 to 2016. MOE= Margin of Error for the 90% confidence interval. Source from the U.S. Census Bureau, Small Area Income and Poverty Estimates, May 2018.

  • API

    Maryland Resident Population Per Square Mile: 2010-2017 | Last Updated 2018-10-17T16:23:18.000Z

    Resident population density for Maryland and Jurisdictions per square mile from 2010 to 2017. Source: U.S. Bureau of Census

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    Toll Transactions | Last Updated 2020-05-05T19:13:05.000Z

    Dataset contains counts of toll transactions collected by the MD Transportation Authority at its eight toll facilities.

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    Reported Sewer Overflows | Last Updated 2018-08-13T20:40:39.000Z

    Reported sewer overflows from January 2005 through December 22, 2016. Although MDE requires that all public sewer system owners or operators report overflows to us, there may be incidents that were not reported. Note that overflow amounts provided by the person reporting the overflow may be estimated using best professional judgment or they may be actual readings from flow measurement devices when available. Penalty information started during 2013.

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    Tax Sales: 2010 - Current | Last Updated 2018-05-03T20:39:24.000Z

    The County holds an annual Tax Sale in May or June of each year. Tax lien certificates for properties with delinquent taxes, water and sewer bills or other liens will be auctioned to the highest bidder. On or about March 1, the County will send a delinquent notice to all property owners with delinquent bills and advertise the delinquent properties in the Howard County Times / Columbia Flier for at least four weeks prior to the sale.

  • API

    Surface Water Quality Assessments | Last Updated 2018-08-13T20:15:11.000Z

    This is the 2014 Integrated Report. EPA approved this submission in accordance with Sections 303(d), 305(b), and 314(l) of the Clean Water Act, on October 16, 2015. The Integrated Report (IR) combines two water quality reports required under sections 305(b) and 303(d) of the federal Clean Water Act. Section 305(b) requires states, territories and authorized tribes to perform annual water quality assessments to determine the status of jurisdictional waters. Section 303(d) requires states, territories and authorized tribes to identify waters assessed as not meeting water quality standards(see Code of Maryland Regulations 26.08.02). Waters that do not meet standards may require a Total Maximum Daily Load to determine the maximum amount of an impairing substance or pollutant that a particular water body can assimilate and still meet water quality criteria. Historically, the 303(d) List and the 305(b) report were submitted to the Environmental Protection Agency (EPA) as separate documents but more recent guidance has called for combining these two reports into a single biennial publication. More information is available at A searchable version of this data is available at