Maryland/Mapping Resources

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Mapping Resources

Maryland's entry in the United State Contributors listing for OpenStreetMap states the following:

All Maryland state GIS data is specifically exempted from having any license under state law. The passed law, Senate Bill 94 (2015) repealed the code that gave governments the authority to compel a citizen to enter into a contract (e.g. a license) before distributing geographic data[1].

Further, all local and municipal governments within in the State of Maryland are governed by the same law. Therefore, even if a county or local government website lists a license requirement, the license is invalidated by the law[2]. Some local governments have not updated their terms after the passage of this bill.

Per these state guidelines, you are free to utilize any of the state, county, or municipal government-provided resources below (in accordance with OpenStreetMap guidelines).

Although some of these links are hosted by regional or community organizations, they are hosting and distributing government-collected and/or funded data.

State-level data

Aerial Imagery

Maryland has its own aerial imagery available in iD since 2016. Please consider using MD Latest 6 Inch Aerial Imagery first, it is the basemap used by all counties in Maryland as the reference.

iMAP

Maryland's GIS Data Catalog is a goldmine of all kinds of geospatial data.

Uncertain of a bridge or culvert? Visit Maryland Bridge Structures (maintained by MDOT).

Road classification? Take a look at MDOT SHA Roadway Functional Classification

Public water access can be found at Maryland Public Water Access

Other environmental data: Maryland's Environmental Resources and Land Information Network

MDOT Maps

Maryland Department of Transportation (MDOT) has released general highway map for each county. In specific county, there are grid maps available with more details.

Maryland Geological Survey

Maryland Department of the Environment

Land and Materials
Water
Air and Radiation
Permits

Maryland Department of Natural Resources

Maryland Transit Administration

Maryland State Archives

Maryland Department of Planning

Maryland Department of Information Technology

Maryland Department of Labor

Maryland Department of Housing and Community Development

Maryland Historical Trust

Maryland Department of Commerce

Maryland State Arts Council

Maryland Department of Emergency Management

University System of Maryland

County and municipal-level data

As of 2022, all counties in Maryland and Baltimore City offer at least some for of public GIS data.

Allegany County

Cumberland

Anne Arundel County

Annapolis

Baltimore City

Baltimore County

Calvert County

Caroline County

Carroll County

Westminster

Cecil County

Charles County

La Plata

Dorchester County

Frederick County

Garrett County

Harford County

Howard County

Kent County

Chestertown

Montgomery County

Gaithersburg
Rockville
Takoma Park

Prince George's County

Bowie
College Park
Laurel

Queen Anne's County

Somerset County

St. Mary's County

Talbot County

Easton

Washington County

Hagerstown

Wicomico County

Salisbury

Worcester County

  1. ↑ Heaton, Brian. March 4, 2015. Maryland Legislation Would Encourage Release of GIS Data. Government Technology Magazine.
  2. ↑ Maryland Association of Counties. March 25, 2015. Senate Bill 94 Support. PDF.
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