Pennsylvania ZIP codes
Pennsylvania holds 2,176 ZIP codes between 15001 and 19612. The tables rank the places and counties with the most codes; the guide below decodes the numbering.
Places with the most ZIP codes in Pennsylvania
| Place | ZIP codes |
|---|---|
| Philadelphia | 87 |
| Pittsburgh | 75 |
| Harrisburg | 26 |
| Erie | 26 |
| Wilkes Barre | 14 |
| Scranton | 13 |
| Reading | 12 |
| Lancaster | 11 |
| Johnstown | 8 |
| Allentown | 8 |
| York | 8 |
| Valley Forge | 7 |
| New Castle | 6 |
| Bethlehem | 6 |
| Mckeesport | 5 |
| Levittown | 5 |
| Easton | 5 |
| Hanover | 5 |
| Boyers | 4 |
| State College | 4 |
Pennsylvania counties by ZIP count
| County | ZIP codes |
|---|---|
| Allegheny | 142 |
| Philadelphia | 85 |
| Westmoreland | 85 |
| Montgomery | 83 |
| Lancaster | 73 |
| Bucks | 67 |
| Chester | 63 |
| Fayette | 61 |
| Schuylkill | 58 |
| Washington | 57 |
Reading a Pennsylvania ZIP code
Pennsylvania holds 2,176 ZIP codes between 15001 and 19612, spread over 67 counties. Philadelphia leads the state with 87 codes, ahead of Pittsburgh with 75. Every code here opens with the digit 1: that opening number is the national postal region Pennsylvania belongs to, the next two digits name the sectional center that sorts the mail, and the final two point to the local office. A ZIP+4 suffix narrows delivery to a block face. Boundaries follow carrier routes rather than city limits, which is why Philadelphia spreads across 87 codes while some rural codes cross county lines.
Source: GeoNames postal dataset (CC BY 4.0), snapshot of 2026-07-09. Counts cover standard delivery ZIPs listed for Pennsylvania; unique and PO box codes may add to these totals.
Last updated: · Methodology and sources