ZIP Codes in Williamsport, PA
Williamsport uses 2 ZIP codes, all in Lycoming County. Pick one below for details, or look up the full nine-digit ZIP+4 for a specific street address.
All 2 Williamsport ZIP codes
| ZIP | Type | County | Population |
|---|---|---|---|
| 17701 | standard | Lycoming | 43,104 |
| 17702 | standard | Lycoming | 10,488 |
Finding a ZIP+4 in Williamsport
Knowing which of these 2 ZIP codes covers an address only gets you partway. The four-digit extension identifies the specific delivery point — typically one side of one block. Two houses facing each other on the same Williamsport street almost always have different ZIP+4 codes even though they share all five leading digits.
Appending ZIP+4 to a mailing list?
Upload a CSV of Williamsport addresses and download it complete.