Grafton Iowa ZIP Codes

Grafton holds a single ZIP code.

Every ZIP code in Grafton

The complete list of Grafton, Iowa ZIP codes with the county each falls in.
ZIP code	County
50440	Worth 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Grafton codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Grafton. 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 Grafton ZIP code begins 504. Those first three digits identify the sectional center facility that processes mail for this part of Iowa. Statewide that range covers 57 ZIP codes, so Grafton accounts for 2% of it.

Every Iowa ZIP prefix and the region it covers →

Area codes covering Grafton

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 Grafton occupies.

641 Area code 641

Grafton Iowa area codes in full →

Where Grafton's ZIP codes sit

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

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

Cities near Grafton

The closest places to Grafton with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Carpenter Iowa ZIP codes	6.4 mi	1 ZIP code
Plymouth Iowa ZIP codes	6.4 mi	1 ZIP code
Manly Iowa ZIP codes	7.3 mi	1 ZIP code
Kensett Iowa ZIP codes	7.3 mi	1 ZIP code
Rock Falls Iowa ZIP codes	8.6 mi	1 ZIP code
Northwood Iowa ZIP codes	11 mi	1 ZIP code
Nora Springs Iowa ZIP codes	13 mi	1 ZIP code
Osage Iowa ZIP codes	13 mi	1 ZIP code

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