Aberdeen is a city located in Harford County, Maryland, approximately 26 miles (42 kilometers) northeast of Baltimore. As of the 2020 United States census, the city had a population of 16,254 residents, making it the largest municipality in Harford County.
The city's strategic location between Baltimore and the Pennsylvania border has shaped its development as a regional hub within the county. Aberdeen serves as a commercial and residential center for the surrounding area, though it remains relatively modest in size compared to major metropolitan centers in the state.