In which county is ZIP code 18103 located?

ZIP 18103 is listed under Lehigh, PA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 18103: Allentown, PA

ZIP: 18103

County: Lehigh

Coordinates: 40.58910, -75.46450

ZIP Type: Standard

Time Zone: Eastern Time (ET)

Get a reliable snapshot of the Allentown, PA postal area 18103. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Allentown
ZIP Code	18103
County	Lehigh
State	PA
Latitude / Longitude	40.58910, -75.46450
ZIP Type	Standard
Time Zone	Eastern Time (ET)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 18103 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 18103 is commonly represented around 40.58910, -75.46450. These coordinates help identify the general area within Lehigh, PA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 18103 for mail delivery and general location reference in Lehigh, PA.

Some addresses near Allentown may share this ZIP due to delivery routing and local service areas.

Related ZIP Codes (Nearby)

Explore other postal codes near Allentown within PA.

Frequently Asked Questions

What is the primary city for ZIP code 18103?

The primary city for this ZIP code is Allentown, located in PA.

In which county is 18103 located?

ZIP code 18103 is situated within Lehigh, PA.

What are the coordinates for 18103?

The approximate center point is 40.58910 (Latitude) and -75.46450 (Longitude).

Is ZIP code 18103 active?

This page lists ZIP 18103 as Listed based on the latest refresh date shown above.

Does ZIP 18103 cover multiple areas?

Yes. Many ZIP codes cover multiple neighborhoods or nearby areas. For exact boundaries, use official mapping tools.

Methodology & Data Notes

How we build this page: We generate this page from a structured ZIP dataset and refresh key fields (city, county, and coordinates) during scheduled updates. Coordinates represent an approximate center point, not an official boundary map.
Sources: Public ZIP reference datasets and geographic coordinate references. If you use specific sources (e.g., USPS, Census), list them on your About/Methodology page.

Page updated: 2026-01-08