Baltimore County, Maryland

county in Maryland, United States

Baltimore County is third-most populous county located in the U.S. state of Maryland and is part of the Baltimore metropolitan area and Baltimore-Washington metropolitan area.[1]

Baltimore County
The Baltimore County Courthouse
The Baltimore County Courthouse
Flag of Baltimore County
Official seal of Baltimore County
"BaCo", "B-More County", "The County"
Map of Maryland highlighting Baltimore County
Location within the U.S. state of Maryland
Map of the United States highlighting Maryland
Maryland's location within the U.S.
Coordinates: 39°24′N 76°36′W / 39.4°N 76.6°W / 39.4; -76.6
Country United States
State Maryland
FoundedJune 30, 1659
Named forCecil Calvert, 2nd Baron Baltimore
Largest communityDundalk
 • Total682 sq mi (1,770 km2)
 • Land598 sq mi (1,550 km2)
 • Water83 sq mi (210 km2)  12%%
 • Total805,029
 • Estimate 
 • Density1,200/sq mi (460/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts1st, 2nd, 3rd, 7th


  1. Baltimore County Timeline (PDF). Archived from the original (PDF) on 2011-07-26.