Aberdeen is a city in Harford County, Maryland, United States. The population was 14,959 at the 2010 census. It was named after Aberdeen City in Scotland by emigrating Scotts. Aberdeen is the largest municipality in Harford County. Aberdeen is part of the Baltimore-Towson Metropolitan Statistical Area (MSA), which is the 20th-largest United States metropolitan area. The nearest city to Aberdeen is Havre de Grace, Maryland, 4.8 miles (7.7 km) to the northeast.