Casco Wisconsin ZIP Codes
Casco holds a single ZIP code.
Every ZIP code in Casco
| ZIP code | County |
|---|---|
| 54205 | Kewaunee 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Casco codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Casco. 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 Casco ZIP code begins 542. Those first three digits identify the sectional center facility that processes mail for this part of Wisconsin. Statewide that range covers 30 ZIP codes, so Casco accounts for 3% of it.
Every Wisconsin ZIP prefix and the region it covers →
Area codes covering Casco
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 Casco occupies.
Casco Wisconsin area codes in full →
Where Casco's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Casco
| City | Distance | ZIP codes |
|---|---|---|
| Luxemburg Wisconsin ZIP codes | 4.3 mi | 1 ZIP code |
| Kewaunee Wisconsin ZIP codes | 8.0 mi | 1 ZIP code |
| Algoma Wisconsin ZIP codes | 9.2 mi | 1 ZIP code |
| Forestville Wisconsin ZIP codes | 12 mi | 1 ZIP code |
| Denmark Wisconsin ZIP codes | 18 mi | 1 ZIP code |
| Green Bay Wisconsin ZIP codes | 18 mi | 12 ZIP codes |
| Suamico Wisconsin ZIP codes | 21 mi | 1 ZIP code |
| Maribel Wisconsin ZIP codes | 21 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.