Ionia Iowa ZIP Codes

Ionia holds a single ZIP code.

Every ZIP code in Ionia

The complete list of Ionia, Iowa ZIP codes with the county each falls in.
ZIP code	County
50645	Chickasaw County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Ionia codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Ionia. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Ionia ZIP code begins 506. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 70 ZIP codes, so Ionia accounts for 1% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Ionia

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Ionia occupies.

641 Area code 641

Ionia Iowa area codes in full →

Where Ionia's ZIP codes sit

Each point is one Ionia ZIP code, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Cities near Ionia

The closest places to Ionia with their own ZIP code list, nearest first.
City	Distance	ZIP codes
North Washington Iowa ZIP codes	6.0 mi	1 ZIP code
Nashua Iowa ZIP codes	7.3 mi	1 ZIP code
New Hampton Iowa ZIP codes	7.4 mi	1 ZIP code
Colwell Iowa ZIP codes	11 mi	1 ZIP code
Charles City Iowa ZIP codes	11 mi	1 ZIP code
Alta Vista Iowa ZIP codes	11 mi	1 ZIP code
Frederika Iowa ZIP codes	13 mi	1 ZIP code
Plainfield Iowa ZIP codes	14 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.