The land area of Baltimore County, MD was 598 in 2017.

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

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    Howard County Police Department Call For Service - 2014-2017 | Last Updated 2018-02-15T15:31:08.000Z

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

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    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

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    Choose Maryland: Compare Counties - Geography | Last Updated 2018-06-18T16:19:56.000Z

    Portrait of county land / land use - area, elevations, and shoreline.

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    Building, Electrical, Fire, Grading, Mechanical, Plumbing & Sign Permits: 2010 - Present | Last Updated 2017-12-04T15:23:39.000Z

    Issued Permits: 01/01/2010 - Present

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    Water Point Source Sample Results | Last Updated 2019-04-19T17:55:36.000Z

    Discharge monitoring reports (DMRs) and monthly operating reports (MORs) for the 58 major WWTPs, 215 minor WWTPs, and 10 major industrial point sources within the State of Maryland and are stored in MDE’s point source database. This data set contains results for nutrients such as phosphorous and nitrogen that may impact water quality in the Chesapeake Bay. This dataset covers the time period from 2008 to 2013.

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    Water Quality Protection Charges | Last Updated 2019-05-01T05:18:07.000Z

    The Water Quality Protection Charge (WQPC) is a line item on your property tax bill. WQPC funds many of the County's clean water initiatives including: • Restoration of eroded stream banks • Upgrades to stormwater ponds • Storm drain cleaning and maintenance • Stream monitoring • Litter control programs • Stormwater facility maintenance • Installation of rain barrels, rain gardens and green roofs The WQPC is calculated based on how much of your property is impervious (does not allow rain to be absorbed into the ground). As the county is developed, more area is covered in impervious concrete, asphalt, driveways, and buildings. Instead, that stormwater collects pollutants and runs off of the impervious surfaces causing damage to streams, rivers and the Chesapeake Bay. This is also known as stormwater pollution. The clean water initiatives funded by the WQPC remediate the environmental damage caused by stormwater pollution. Further, the WQPC funds programs that are needed to meet the National Pollutant Discharge Elimination System permit from the state of Maryland. Update Frequency : Annually

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    Maryland Median Household Income By Year With Margin Of Error: 2007-2016 | Last Updated 2018-10-17T20:15:32.000Z

    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.

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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.

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    Quarterly Census of Employment and Wages - Statewide and All Counties | Last Updated 2019-01-22T15:17:40.000Z

    Maryland Statewide and County employment by industry from the Quarterly Census of Employment and Wages

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    Maryland Real Property Assessments: Hidden Property Owner Names | Last Updated 2019-05-14T04:13:40.000Z

    Please read all metadata before accessing the dataset. Note that records shown here are updated at different frequencies from data in products from MDP and SDAT. Please see the full documentation at and review the dedicated metadata site (