In which county is ZIP code 51009 located?

ZIP 51009 is listed under OBrien, IA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 51009: Calumet, IA

ZIP: 51009

County: OBrien

Coordinates: 42.94440, -95.55150

ZIP Type: Standard

Time Zone: Central Time (CT)

This profile provides an in-depth look at ZIP code 51009, serving Calumet in IA. It lies in OBrien and supports delivery, planning, and address verification.

Primary City	Calumet
ZIP Code	51009
County	OBrien
State	IA
Latitude / Longitude	42.94440, -95.55150
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 51009 (not an exact boundary).

Geographic & Administrative Context

The geographic center of ZIP code 51009 is approximately 42.94440 (latitude) and -95.55150 (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 51009 for mail delivery and general location reference in OBrien, IA.

Coverage may include nearby neighborhoods and adjacent unincorporated areas commonly associated with Calumet.

Related ZIP Codes (Nearby)

Explore other postal codes near Calumet within IA.

Frequently Asked Questions

What is the primary city for ZIP code 51009?

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

In which county is 51009 located?

ZIP code 51009 is situated within OBrien, IA.

What are the coordinates for 51009?

The approximate center point is 42.94440 (Latitude) and -95.55150 (Longitude).

Is ZIP code 51009 active?

This page lists ZIP 51009 as Listed based on the latest refresh date shown above.

Does ZIP 51009 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