ZIP Code 18109
18109 is one of Pennsylvania's ZIP codes, delivering to addresses in Allentown, Lehigh County.
- City
- Allentown
- County
- Lehigh County
- State
- Pennsylvania
- Prefix
- 181xx
Where this code sits
18109 is part of the 181xx range, the group of codes handled by one mail processing centre. Allentown is served by 8 ZIP codes in total; the full list, with the county each falls in, is on the Allentown page.
Allentown Pennsylvania ZIP codes →
Area codes over the same ground
Postal and telephone geography are drawn separately, so these codes cover the area 18109 delivers to without sharing its boundary.
ZIP codes nearest 18109
| ZIP code | Distance | Delivers to |
|---|---|---|
| ZIP code 18032 | 2.0 mi | Catasauqua, PA |
| ZIP code 18002 | 2.1 mi | Lehigh Valley, PA |
| ZIP code 18018 | 2.6 mi | Bethlehem, PA |
| ZIP code 18101 | 2.8 mi | Allentown, PA |
| ZIP code 18102 | 2.9 mi | Allentown, PA |
| ZIP code 18017 | 3.2 mi | Bethlehem, PA |
| ZIP code 18105 | 3.3 mi | Allentown, PA |
| ZIP code 18103 | 3.5 mi | Allentown, PA |
Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope ZIP code 18109. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.