ZIP codes in Union County
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- 17829 HartletonUnion County
- 17835 LaureltonUnion County
- 17837 LewisburgUnion County
- 17844 MifflinburgUnion County
- 17845 MifflinburgUnion County
- 17855 New BerlinUnion County
- 17856 West MiltonUnion County
- 17880 MillmontUnion County
- 17885 WeikertUnion County
- 17886 West MiltonUnion County
- 17887 White DeerUnion County
- 17889 WinfieldUnion County