ZIP Code 18103
18103 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
18103 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 18103 delivers to without sharing its boundary.
ZIP codes nearest 18103
| ZIP code | Distance | Delivers to |
|---|---|---|
| ZIP code 18101 | 1.0 mi | Allentown, PA |
| ZIP code 18102 | 1.4 mi | Allentown, PA |
| ZIP code 18105 | 1.9 mi | Allentown, PA |
| ZIP code 18104 | 3.2 mi | Allentown, PA |
| ZIP code 18109 | 3.5 mi | Allentown, PA |
| ZIP code 18098 | 3.8 mi | Emmaus, PA |
| ZIP code 18099 | 3.8 mi | Emmaus, PA |
| ZIP code 18034 | 4.0 mi | Center Valley, 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 18103. 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.