Eureka South Dakota ZIP Codes
Eureka holds a single ZIP code.
Every ZIP code in Eureka
| ZIP code | County |
|---|---|
| 57437 | McPherson 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Eureka codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Eureka. 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 Eureka ZIP code begins 574. Those first three digits identify the sectional center facility that processes mail for this part of South Dakota. Statewide that range covers 50 ZIP codes, so Eureka accounts for 2% of it.
Every South Dakota ZIP prefix and the region it covers →
Area codes covering Eureka
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 Eureka occupies.
Eureka South Dakota area codes in full →
Where Eureka's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Eureka
| City | Distance | ZIP codes |
|---|---|---|
| Hosmer South Dakota ZIP codes | 15 mi | 1 ZIP code |
| Long Lake South Dakota ZIP codes | 21 mi | 1 ZIP code |
| Mound City South Dakota ZIP codes | 22 mi | 1 ZIP code |
| Bowdle South Dakota ZIP codes | 22 mi | 1 ZIP code |
| Herreid South Dakota ZIP codes | 22 mi | 1 ZIP code |
| Java South Dakota ZIP codes | 22 mi | 1 ZIP code |
| Roscoe South Dakota ZIP codes | 26 mi | 1 ZIP code |
| Selby South Dakota ZIP codes | 27 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.