Grant County, SD ZIP codes
There are 10 ZIP codes in Grant County, SD, in 10 towns, from 57216 to 57269. The largest are 57252 (Milbank), 57216 (Big Stone City) and 57266 (Summit). 1 more crosses into it from a neighbouring county: 57263.
The county seat is Milbank.
- ZIP codes
- 10
- Partly in it
- 1 more
- Towns
- 10
- County seat
- Milbank
- County FIPS
46051- State
- South Dakota
- Population
- 7,563
- Median household income
- $75,028
- Land area
- 681 sq mi
Grant County ZIP codes by town
Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.
ZIP codes partly in Grant County
This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Grant County.
- 57263 South Shore · mostly in Codington County
Map of Grant County ZIP codes
The ZIP codes of Grant County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.
Grant County in numbers
About 7,563 people live in Grant County, in 3,029 households, the 23rd most populous of South Dakota's 66 counties. The median household income is $75,028 a year, about the same as the South Dakota median of $75,081 (US: $80,734). The median owner-occupied home is valued at $171,000 (34% below the South Dakota median), and median gross rent is $763 a month. The median age is 44.5; 25.3% of adults 25 and over hold a bachelor's degree or higher (31.9% across South Dakota); the average commute takes 14 minutes.
| Population | 7,563 |
|---|---|
| Households | 3,029 |
| Median age | 44.5 |
| Median household income | $75,028 |
| Median home value | $171,000 |
| Median gross rent | $763 |
| Bachelor's degree or higher | 25.3% |
| Mean commute | 13.7 min |
| Population density | 11 / sq mi |
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.
Largest towns in Grant County
| Town | ZIP codes | Population |
|---|---|---|
| Milbank | 1 | 3,525 |
| Big Stone City | 1 | 706 |
| Summit | 1 | 359 |
| Labolt | 1 | 132 |
| Revillo | 1 | 88 |
| Stockholm | 1 | 74 |
| Ortley | 1 | 73 |
| Strandburg | 1 | 58 |
| Twin Brooks | 1 | 29 |
| Marvin | 1 | 19 |
Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.
Neighbouring counties
Counties that share a ZIP code with Grant County.
Not sure you are in Grant County? What county am I in? answers from your location, near a county line included.
Every ZIP code in Grant County, with figures
| ZIP | City | Type | Population | Median income | Median home |
|---|---|---|---|---|---|
57216 | Big Stone City , SD | Standard | 1,584 | $88,203 | $201,300 |
57246 | Labolt , SD | Standard | 132 | $72,917 | $90,000 |
57251 | Marvin , SD | Standard | 228 | $72,292 | $75,000 |
57252 | Milbank , SD | Standard | 4,883 | $70,479 | $183,000 |
57256 | Ortley , SD | Standard | 238 | $66,500 | $225,000 |
57259 | Revillo , SD | Standard | 477 | $80,250 | $259,800 |
57264 | Stockholm , SD | Standard | 191 | $79,583 | $112,500 |
57265 | Strandburg , SD | Standard | 202 | $69,519 | $114,600 |
57266 | Summit , SD | Standard | 626 | $72,500 | $162,500 |
57269 | Twin Brooks , SD | Standard | 186 | $98,333 | $410,600 |
Cite this page
zipcodes.pro. “Grant County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/sd/county/grant
Underlying data is public domain or openly licensed — sources, vintages and licences.