Groton South Dakota ZIP Codes
Groton holds a single ZIP code.
Every ZIP code in Groton
| ZIP code | County |
|---|---|
| 57445 | Brown 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Groton codes above are listed without a column we would have to invent.
Scope every ZIP code recorded for Groton. 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 Groton 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 Groton accounts for 2% of it.
Every South Dakota ZIP prefix and the region it covers →
Area codes covering Groton
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 Groton occupies.
Groton South Dakota area codes in full →
Where Groton's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Cities near Groton
| City | Distance | ZIP codes |
|---|---|---|
| Andover South Dakota ZIP codes | 9.9 mi | 1 ZIP code |
| Pierpont South Dakota ZIP codes | 13 mi | 1 ZIP code |
| Stratford South Dakota ZIP codes | 14 mi | 1 ZIP code |
| Columbia South Dakota ZIP codes | 15 mi | 1 ZIP code |
| Claremont South Dakota ZIP codes | 16 mi | 1 ZIP code |
| Langford South Dakota ZIP codes | 17 mi | 1 ZIP code |
| Aberdeen South Dakota ZIP codes | 18 mi | 2 ZIP codes |
| Bristol South Dakota ZIP codes | 19 mi | 1 ZIP code |
Straight-line distance between place reference points, not driving distance.