ZIP codes in Frederick County
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- 21701 FrederickFrederick County
- 21702 FrederickFrederick County
- 21703 FrederickFrederick County
- 21704 FrederickFrederick County
- 21705 FrederickFrederick County
- 21710 AdamstownFrederick County
- 21714 Braddock HeightsFrederick County
- 21716 BrunswickFrederick County
- 21717 BuckeystownFrederick County
- 21718 BurkittsvilleFrederick County
- 21727 EmmitsburgFrederick County
- 21754 New MarketFrederick County
- 21755 JeffersonFrederick County
- 21757 KeymarFrederick County
- 21758 BrunswickFrederick County
- 21762 LibertytownFrederick County
- 21769 MiddletownFrederick County
- 21770 MonroviaFrederick County
- 21773 MyersvilleFrederick County
- 21774 New MarketFrederick County
- 21777 Point Of RocksFrederick County
- 21778 Rocky RidgeFrederick County
- 21780 SabillasvilleFrederick County
- 21788 ThurmontFrederick County
- 21790 Point Of RocksFrederick County
- 21791 Union BridgeFrederick County
- 21793 WalkersvilleFrederick County
- 21798 WoodsboroFrederick County