Invalid zip code in Eastern PA, USA

18902 shows as invalid US zip code (but it is valid).

Also, here is a listing of all areas with zip codes from the US Postal Service so that other zip codes can be added as well: ZIP Codes by Area and District codes | PostalPro

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Mine was not listed as well (33579) but I used a nearby zip code and it took it. I would also like to use my correct zip code.

Zip code 18902 has been added.