In which county is ZIP code 18631 located?

ZIP 18631 is listed under Columbia, PA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 18631: Mifflinville, PA

ZIP: 18631

County: Columbia

Coordinates: 41.03230, -76.30800

ZIP Type: Standard

Time Zone: Eastern Time (ET)

This profile provides an in-depth look at ZIP code 18631, serving Mifflinville in PA. It lies in Columbia and supports delivery, planning, and address verification.

Primary City	Mifflinville
ZIP Code	18631
County	Columbia
State	PA
Latitude / Longitude	41.03230, -76.30800
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 18631 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 18631 is commonly represented around 41.03230, -76.30800. These coordinates help identify the general area within Columbia, PA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 18631 for mail delivery and general location reference in Columbia, PA.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Mifflinville within PA.

Frequently Asked Questions

What is the primary city for ZIP code 18631?

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

In which county is 18631 located?

ZIP code 18631 is situated within Columbia, PA.

What are the coordinates for 18631?

The approximate center point is 41.03230 (Latitude) and -76.30800 (Longitude).

Is ZIP code 18631 active?

This page lists ZIP 18631 as Listed based on the latest refresh date shown above.

Does ZIP 18631 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