In which county is ZIP code 51040 located?

ZIP 51040 is listed under Monona, IA.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 51040: Onawa, IA

ZIP: 51040

County: Monona

Coordinates: 42.03700, -96.10720

ZIP Type: Standard

Time Zone: Central Time (CT)

Explore detailed information for ZIP code 51040 in Onawa, IA. We include verified county details for Monona plus key geographic references used for mapping and logistics.

Primary City	Onawa
ZIP Code	51040
County	Monona
State	IA
Latitude / Longitude	42.03700, -96.10720
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 51040 (not an exact boundary).

Geographic & Administrative Context

Coordinates for 51040 are listed as 42.03700 / -96.10720, useful for GPS and service checks in and around Onawa, IA.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 51040 for mail delivery and general location reference in Monona, IA.

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

Related ZIP Codes (Nearby)

Explore other postal codes near Onawa within IA.

Frequently Asked Questions

What is the primary city for ZIP code 51040?

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

In which county is 51040 located?

ZIP code 51040 is situated within Monona, IA.

What are the coordinates for 51040?

The approximate center point is 42.03700 (Latitude) and -96.10720 (Longitude).

Is ZIP code 51040 active?

This page lists ZIP 51040 as Listed based on the latest refresh date shown above.

Does ZIP 51040 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