Cities and Towns in Harford County, Maryland
Founded in 1773, Harford County is one of 23 counties in the state of Maryland. Historically, Harford County was formed from part of Baltimore County. The city of Bel Air is the county seat. With FIPS code of 25, Harford County has a population of 262,977 and area of 527 square miles (1,365 km²).
List of all cities in Harford County, MD alphabetically
| City/Town | Postal Code | Area Code |
| Aber Prov Grd, MD | 21005 | 410/443/667 |
| 21010 | 410/443/667 | |
| Aberdeen, MD | 21001 | 410/443/667 |
| Aberdeen Proving Ground, MD | 21005 | 410/443/667 |
| 21010 | 410/443/667 | |
| Abingdon, MD | 21009 | 410/443/667 |
| APG, MD | 21005 | 410/443/667 |
| Bel Air, MD | 21014 | 410/443/667 |
| 21015 | 410/443/667 | |
| Belcamp, MD | 21017 | 410/443/667 |
| Benson, MD | 21018 | 410/443/667 |
| Cardiff, MD | 21160 | 410/443/667 |
| Churchville, MD | 21028 | 410/443/667 |
| Darlington, MD | 21034 | 410/443/667 |
| Edgewood, MD | 21040 | 410/443/667 |
| Edgewood Arsenal, MD | 21010 | 410/443/667 |
| Fallston, MD | 21047 | 410/443/667 |
| Forest Hill, MD | 21050 | 410/443/667 |
| Gunpowder, MD | 21010 | 410/443/667 |
| Havre de Grace, MD | 21078 | 410/443/667 |
| Hvre de Grace, MD | 21078 | 410/443/667 |
| Jarrettsville, MD | 21084 | 410/443/667 |
| Joppa, MD | 21085 | 410/443/667 |
| Joppatowne, MD | 21085 | 410/443/667 |
| Magnolia, MD | 21085 | 410/443/667 |
| Norrisville, MD | 21161 | 410/443/667 |
| Perryman, MD | 21130 | 410/443/667 |
| Pylesville, MD | 21132 | 410/443/667 |
| Riverside, MD | 21017 | 410/443/667 |
| Street, MD | 21154 | 410/443/667 |
| White Hall, MD | 21161 | 410/443/667 |
| Whiteford, MD | 21160 | 410/443/667 |
