Buffalo County, SD ZIP Codes
4 ZIP codes cover all or part of Buffalo County, South Dakota: 57325, 57339, 57370 and 57341. The Census Bureau counts 1,808 residents in the county, with a median household income of $47,045 and a median home value of $117,800. Median household income ranges from $46,136 in 57339 to $80,139 in 57325. Its largest communities include Fort Thompson and Gann Valley.
Buffalo County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 1,808 |
| Households | 508 |
| Median household income | $47,045 |
| Median home value | $117,800 |
| Median age | 22.8 |
| Median rent | $540 |
All 4 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 5,698 |
| Households (sum of ZIP codes) | 1,917 |
| Median household income, range across ZIP codes | $46,136 (57339) to $80,139 (57325) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $72,020 |
| Homeowners | 68.7% |
| Households with kids under 18 | 32.5% |
| Moved in the past year | 7.0% |
| Carrier routes in EDDM2GO's route library | 2 routes, 253 homes (1 of 4 ZIP codes) |
Top facts
- Highest median household income in Buffalo County: 57325 ($80,139)
- Most residents: 57325 (3,335 people)
- Highest homeownership: 57325 (74.9% own their home)
- Most households with kids: 57339 (44.9% of households)
- Most new movers: 57325 (9.6% moved in last year)
- Youngest median age: 57339 (21.3 years)
- Highest median home value: 57325 ($230,300)
Every ZIP code in Buffalo County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57325 | Chamberlain | 3,335 | 1,186 | $80,139 | $230,300 | 74.9% | 30.6% | 9.6% | — | — | 36% of its land |
| 57339 | Fort Thompson | 1,390 | 372 | $46,136 | $121,700 | 43.5% | 44.9% | 0.2% | — | — | 100% of its land |
| 57370 | Pukwana | 894 | 332 | $58,824 | $180,200 | 73.8% | 25.0% | 8.6% | 2 | 256 | 22% of its land |
| 57341 | Gann Valley | 79 | 27 | — | — | 81.5% | 37.0% | 0.0% | — | — | 96% of its land |
A ZIP code is listed for Buffalo County when at least 10% of its land is in the county, when it holds at least 10% of the county's land, or when the county is its main county. Totals add up whole ZIP codes, including parts that cross the county line; the Census county figures above do not.
Cities and communities
- Fort Thompson — 1,147 residents · 1 ZIP code
- Gann Valley — 6 residents · 1 ZIP code
Price a mailing to Buffalo County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Buffalo County, SD?
- 57325, 57339, 57370 and 57341. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Buffalo County?
- 1,808 residents in 508 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Buffalo County?
- $47,045 for the county as a whole. Its ZIP codes range from $46,136 (57339) to $80,139 (57325).
- Which Buffalo County ZIP code has the highest median household income?
- 57325, at $80,139, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Buffalo County?
- For the 1 of 4 ZIP codes in EDDM2GO's stored route library: 2 carrier routes reaching 253 residential and 3 business mailboxes. The route map loads the rest when you search them.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.