Dewey County, SD ZIP Codes
10 ZIP codes cover all or part of Dewey County, South Dakota. The Census Bureau counts 5,205 residents in the county, with a median household income of $54,104 and a median home value of $69,600. Median household income ranges from $43,235 in 57625 to $66,094 in 57656. Its largest communities include Mobridge, North Eagle Butte, Eagle Butte, Timber Lake and La Plant.
Dewey County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 5,205 |
| Households | 1,692 |
| Median household income | $54,104 |
| Median home value | $69,600 |
| Median age | 27.7 |
| Median rent | $692 |
All 10 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 11,218 |
| Households (sum of ZIP codes) | 4,433 |
| Median household income, range across ZIP codes | $43,235 (57625) to $66,094 (57656) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $59,289 |
| Homeowners | 69.0% |
| Households with kids under 18 | 34.3% |
| Moved in the past year | 7.9% |
| Carrier routes in EDDM2GO's route library | 8 routes, 893 homes (4 of 10 ZIP codes) |
Top facts
- Highest median household income in Dewey County: 57656 ($66,094)
- Most residents: 57625 (3,775 people)
- Highest homeownership: 57442 (80.9% own their home)
- Most households with kids: 57625 (47.6% of households)
- Most new movers: 57601 (17.6% moved in last year)
- Youngest median age: 57625 (27.7 years)
- Highest median home value: 57601 ($154,600)
Every ZIP code in Dewey County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57625 | Eagle Butte | 3,775 | 1,172 | $43,235 | $68,000 | 54.9% | 47.6% | 2.3% | — | — | 77% of its land |
| 57601 | Mobridge | 3,422 | 1,650 | $66,003 | $154,600 | 73.2% | 28.6% | 17.6% | — | — | 85% of its land |
| 57442 | Gettysburg | 1,772 | 823 | $65,625 | $134,600 | 80.9% | 18.5% | 7.4% | 5 | 844 | 14% of its land |
| 57656 | Timber Lake | 1,000 | 371 | $66,094 | $86,300 | 71.4% | 41.2% | 3.2% | 1 | 85 | 64% of its land |
| 57633 | Isabel | 445 | 183 | $78,750 | $70,000 | 76.5% | 40.4% | 7.9% | — | — | 21% of its land |
| 57652 | La Plant | 265 | 53 | $19,327 | — | 20.8% | 56.6% | 0.0% | 1 | 19 | 100% of its land |
| 57657 | Corson County | 247 | 75 | — | $57,100 | 88.0% | 33.3% | 0.0% | — | — | 22% of its land |
| 57661 | Whitehorse | 177 | 56 | $55,000 | — | 28.6% | 53.6% | 0.0% | — | — | 100% of its land |
| 57636 | Lantry | 104 | 41 | $112,375 | $108,800 | 80.5% | 68.3% | 0.0% | — | — | 100% of its land |
| 57630 | Whitehorse | 11 | 9 | — | — | 100.0% | 0.0% | 0.0% | 1 | 19 | 100% of its land |
A ZIP code is listed for Dewey 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
- Mobridge — 2,932 residents · 1 ZIP code
- North Eagle Butte — 1,481 residents · 1 ZIP code
- Eagle Butte — 1,458 residents · 1 ZIP code
- Timber Lake — 779 residents · 1 ZIP code
- La Plant — 240 residents · 1 ZIP code
- Whitehorse — 162 residents · 2 ZIP codes
- Green Grass — 78 residents · 1 ZIP code
- Lantry — 3 residents · 1 ZIP code
Price a mailing to Dewey County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Dewey County, SD?
- 57625, 57601, 57442, 57656, 57633, 57652, 57657, 57661, 57636 and 57630. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Dewey County?
- 5,205 residents in 1,692 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Dewey County?
- $54,104 for the county as a whole. Its ZIP codes range from $43,235 (57625) to $66,094 (57656).
- Which Dewey County ZIP code has the highest median household income?
- 57656, at $66,094, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Dewey County?
- For the 4 of 10 ZIP codes in EDDM2GO's stored route library: 8 carrier routes reaching 893 residential and 74 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.