Castlewood South Dakota ZIP Codes
Castlewood holds a single ZIP code.
Every ZIP code in Castlewood
| ZIP code | County |
|---|---|
| 57223 | Hamlin 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Castlewood codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Castlewood. 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 Castlewood ZIP code begins 572. Those first three digits identify the sectional center facility that processes mail for this part of South Dakota. Statewide that range covers 56 ZIP codes, so Castlewood accounts for 2% of it.
Every South Dakota ZIP prefix and the region it covers →
Area codes covering Castlewood
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 Castlewood occupies.
Castlewood South Dakota area codes in full →
Where Castlewood's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Castlewood
| City | Distance | ZIP codes |
|---|---|---|
| Hayti South Dakota ZIP codes | 9.6 mi | 1 ZIP code |
| Estelline South Dakota ZIP codes | 12 mi | 1 ZIP code |
| Kranzburg South Dakota ZIP codes | 13 mi | 1 ZIP code |
| Lake Norden South Dakota ZIP codes | 13 mi | 1 ZIP code |
| Goodwin South Dakota ZIP codes | 14 mi | 1 ZIP code |
| Watertown South Dakota ZIP codes | 14 mi | 1 ZIP code |
| Clear Lake South Dakota ZIP codes | 17 mi | 1 ZIP code |
| Hazel South Dakota ZIP codes | 17 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.