In which county is ZIP code 51231 located?

ZIP 51231 is listed under OBrien, IA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 51231: Archer, IA

ZIP: 51231

County: OBrien

Coordinates: 43.11790, -95.74170

ZIP Type: Standard

Time Zone: Central Time (CT)

Get a reliable snapshot of the Archer, IA postal area 51231. This page summarizes county, coordinates, and local facts to help with services and location research.

Primary City	Archer
ZIP Code	51231
County	OBrien
State	IA
Latitude / Longitude	43.11790, -95.74170
ZIP Type	Standard
Time Zone	Central Time (CT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 51231 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 51231 is approximately 43.11790 (latitude) and -95.74170 (longitude). This location sits within OBrien, contributing to regional planning across IA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 51231 for mail delivery and general location reference in OBrien, IA.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Archer within IA.

Frequently Asked Questions

What is the primary city for ZIP code 51231?

The primary city for this ZIP code is Archer, located in IA.

In which county is 51231 located?

ZIP code 51231 is situated within OBrien, IA.

What are the coordinates for 51231?

The approximate center point is 43.11790 (Latitude) and -95.74170 (Longitude).

Is ZIP code 51231 active?

This page lists ZIP 51231 as Listed based on the latest refresh date shown above.

Does ZIP 51231 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