Maryland

Across Maryland, GIS Map currently maps 40 cities and towns that together hold around 2,259,847 residents. The Old Line State features Chesapeake Bay, colonial history, and proximity to Washington D.C. The most populous community is Baltimore, with about 573,243 residents in Baltimore City County, and it has an interactive street, satellite and topographic map. Columbia (104,338) and Germantown (90,719) follow. The state capital, Annapolis, sits in Anne Arundel County.

County-level coverage in Maryland includes 24 official Census boundaries, each paired with local demographics. Montgomery County is the most populous, with about 1,065,949 residents. The highest median household income belongs to Howard County at $149,763. By land area, Frederick County is the largest at roughly 661 square miles. The youngest population, with a median age of 36.2, is found in Baltimore city. Among mapped cities with at least 10,000 residents, Bethesda reports the highest median household income at $192,237. All figures come from the U.S. Census Bureau's American Community Survey 2020-2024 five-year estimates.

Maryland's mapped cities sit at a wide range of elevations. Westminster is the highest at about 800 feet above sea level, while Ocean City is the lowest at about 4 feet. Every mapped city observes Eastern Time. According to the USDA U.S. General Soil Map, Ultisols are the dominant soil order beneath 21 of the mapped city centers. Federal records list 126 government-owned and 184 leased properties in these cities, the most in Silver Spring. City maps let you switch on FEMA flood zones, USGS contours and land cover layers.

We also map 110 ZIP code areas in Maryland, each with its boundary and demographics. The most populated one has about 70,595 residents. The runner-up counts roughly 66,115 people. The densest packs about 19,538 people per square mile. Every page includes drawing and measuring tools plus a click-anywhere inspector that reports the county, ZIP, census tract, school district, flood zone and elevation of any point.