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Enter a corporate or residential street address, city, and state to see a specific zip code ™. Web 22 rows data last updated: Web harford has 21 zip codes, 13 cities, 3 area codes and 12 post offices. Web harford (md) zip codes: Web view a harford county, maryland zip code map on google maps and answer what is my harford county,. Use our zip code lookup by address (or map). Web harford county maryland is covered by a total of 25 zip codes. Web find homes in popular harford county md zip codes or search by region, city or neighborhood. Below you will find more info about harford and also zip. 21001 | 21005 | 21009. Web zip codes in harford county with associated cities & towns. There are 5 zip codes in harford county that extend into adjacent.