Below is a list of Harford County MD zip codes. For your research we have also included Harford County Area Code, Time Zone, UTC and the local County FIPS Code. Each Harford County Maryland zip code has a center Longitude / Latitude point (the Harford County center is -76.318000793457 / 39.544498443604). For your convenience we have also indicated if that zip code in Harford County observes Daylight Savings time.