ZIP codes in Harford County
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- 21001 AberdeenHarford County
- 21005 Aberdeen Proving GroundHarford County
- 21009 AbingdonHarford County
- 21010 Aberdeen Proving GroundHarford County
- 21014 Bel AirHarford County
- 21015 Bel AirHarford County
- 21017 BelcampHarford County
- 21028 ChurchvilleHarford County
- 21034 DarlingtonHarford County
- 21040 EdgewoodHarford County
- 21047 FallstonHarford County
- 21050 Forest HillHarford County
- 21078 Havre De GraceHarford County
- 21084 JarrettsvilleHarford County
- 21085 JoppaHarford County
- 21130 PerrymanHarford County
- 21132 PylesvilleHarford County
- 21154 StreetHarford County
- 21160 StreetHarford County
- 21161 White HallHarford County