Custer South Dakota ZIP Codes
Custer holds a single ZIP code.
Every ZIP code in Custer
| ZIP code | County |
|---|---|
| 57730 | Custer 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Custer codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Custer. 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 Custer ZIP code begins 577. Those first three digits identify the sectional center facility that processes mail for this part of South Dakota. Statewide that range covers 58 ZIP codes, so Custer accounts for 2% of it.
Every South Dakota ZIP prefix and the region it covers →
Area codes covering Custer
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 Custer occupies.
Custer South Dakota area codes in full →
Where Custer's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Custer
| City | Distance | ZIP codes |
|---|---|---|
| Pringle South Dakota ZIP codes | 11 mi | 1 ZIP code |
| Hill City South Dakota ZIP codes | 12 mi | 1 ZIP code |
| Keystone South Dakota ZIP codes | 12 mi | 1 ZIP code |
| Fairburn South Dakota ZIP codes | 20 mi | 1 ZIP code |
| Hermosa South Dakota ZIP codes | 21 mi | 1 ZIP code |
| Buffalo Gap South Dakota ZIP codes | 24 mi | 1 ZIP code |
| Hot Springs South Dakota ZIP codes | 25 mi | 1 ZIP code |
| Rapid City South Dakota ZIP codes | 28 mi | 4 ZIP codes |
Straight-line distance between place reference points, not driving distance.