Mason City Illinois ZIP Codes
Mason City holds a single ZIP code.
Every ZIP code in Mason City
| ZIP code | County |
|---|---|
| 62664 | Mason 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Mason City codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Mason City. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated . ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.
How these codes cluster
Every Mason City ZIP code begins 626. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 62 ZIP codes, so Mason City accounts for 2% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering Mason City
ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The codes below serve the same ground Mason City occupies.
Mason City Illinois area codes in full →
Where Mason City's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Mason City
| City | Distance | ZIP codes |
|---|---|---|
| Mason Illinois ZIP codes | 0.0 mi | 1 ZIP code |
| Edgewood Illinois ZIP codes | 3.0 mi | 1 ZIP code |
| Watson Illinois ZIP codes | 5.9 mi | 1 ZIP code |
| Altamont Illinois ZIP codes | 9.5 mi | 1 ZIP code |
| Farina Illinois ZIP codes | 12 mi | 1 ZIP code |
| Effingham Illinois ZIP codes | 12 mi | 1 ZIP code |
| Louisville Illinois ZIP codes | 14 mi | 1 ZIP code |
| Teutopolis Illinois ZIP codes | 15 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.