In which county is ZIP code 83421 located?

ZIP 83421 is listed under Fremont, ID.

When was this page updated?

This page was updated on 2026-01-08.

ZIP Code 83421: Chester, ID

ZIP: 83421

County: Fremont

Coordinates: 44.00110, -111.53510

ZIP Type: Standard

Time Zone: Mountain Time (MT)

This profile provides an in-depth look at ZIP code 83421, serving Chester in ID. It lies in Fremont and supports delivery, planning, and address verification.

Primary City	Chester
ZIP Code	83421
County	Fremont
State	ID
Latitude / Longitude	44.00110, -111.53510
ZIP Type	Standard
Time Zone	Mountain Time (MT)
Data Updated	2026-01-08

Maps & Useful Links

Open in Maps: Google Maps · OpenStreetMap

These links show the approximate center point for ZIP 83421 (not an exact boundary).

Geographic & Administrative Context

For mapping and verification, 83421 is commonly represented around 44.00110, -111.53510. These coordinates help identify the general area within Fremont, ID.

Local Coverage Notes

ZIP codes can cover multiple neighborhoods and unincorporated areas. Use ZIP 83421 for mail delivery and general location reference in Fremont, ID.

This ZIP may extend beyond the city core into nearby communities within Fremont.

Related ZIP Codes (Nearby)

Explore other postal codes near Chester within ID.

Frequently Asked Questions

What is the primary city for ZIP code 83421?

The primary city for this ZIP code is Chester, located in ID.

In which county is 83421 located?

ZIP code 83421 is situated within Fremont, ID.

What are the coordinates for 83421?

The approximate center point is 44.00110 (Latitude) and -111.53510 (Longitude).

Is ZIP code 83421 active?

This page lists ZIP 83421 as Listed based on the latest refresh date shown above.

Does ZIP 83421 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