South Wilmington Illinois ZIP Codes
South Wilmington holds a single ZIP code.
Every ZIP code in South Wilmington
| ZIP code | County |
|---|---|
| 60474 | Grundy 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 South Wilmington codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for South Wilmington. 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 South Wilmington ZIP code begins 604. Those first three digits identify the sectional center facility that processes mail for this part of Illinois. Statewide that range covers 83 ZIP codes, so South Wilmington accounts for 1% of it.
Every Illinois ZIP prefix and the region it covers →
Area codes covering South Wilmington
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 South Wilmington occupies.
South Wilmington Illinois area codes in full →
Where South Wilmington's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near South Wilmington
| City | Distance | ZIP codes |
|---|---|---|
| Gardner Illinois ZIP codes | 2.2 mi | 1 ZIP code |
| Braceville Illinois ZIP codes | 3.6 mi | 1 ZIP code |
| Essex Illinois ZIP codes | 4.6 mi | 1 ZIP code |
| Reddick Illinois ZIP codes | 5.5 mi | 1 ZIP code |
| Coal City Illinois ZIP codes | 7.2 mi | 1 ZIP code |
| Braidwood Illinois ZIP codes | 7.2 mi | 1 ZIP code |
| Union Hill Illinois ZIP codes | 8.3 mi | 1 ZIP code |
| Mazon Illinois ZIP codes | 8.8 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.