ZIP codes in Butler County
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- 16001 ButlerButler County
- 16002 ButlerButler County
- 16020 BoyersButler County
- 16022 BruinButler County
- 16023 CabotButler County
- 16024 CalleryButler County
- 16025 ChicoraButler County
- 16027 ConnoquenessingButler County
- 16029 East ButlerButler County
- 16030 Eau ClaireButler County
- 16033 Evans CityButler County
- 16034 ChicoraButler County
- 16035 ForestvilleButler County
- 16037 ZelienopleButler County
- 16038 HarrisvilleButler County
- 16040 BoyersButler County
- 16041 Karns CityButler County
- 16045 ButlerButler County
- 16046 MarsButler County
- 16048 North WashingtonButler County
- 16050 PetroliaButler County
- 16051 New CastleButler County
- 16052 New CastleButler County
- 16053 RenfrewButler County
- 16055 SarverButler County
- 16056 SaxonburgButler County
- 16057 New CastleButler County
- 16059 ValenciaButler County
- 16061 West SunburyButler County
- 16063 ZelienopleButler County
- 16066 Cranberry TownshipButler County