There are 20 zip codes in Harford County, Maryland. The most populated is 21014, located in Bel Air. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
Population
City
2101437,097Bel Air
2100932,565Abingdon
2101530,485Bel Air
2100125,908Aberdeen
2104025,110Edgewood
2107819,820Havre De Grace
2105018,076Forest Hill
2108516,590Joppa
2104713,419Fallston
210847,366Jarrettsville
211547,059Street
210176,177Belcamp
211615,625White Hall
211323,110Pylesville
210282,974Churchville
210342,958Darlington
211602,716Whiteford
210052,703Aberdeen Proving Ground
21010216Gunpowder
2113021Perryman

Zip Codes in Harford County, Maryland by Population (2024)