Lake County, SD ZIP Codes
7 ZIP codes cover all or part of Lake County, South Dakota: 57042, 57075, 57054, 57016, 57076, 57057 and 57050. The Census Bureau counts 10,972 residents in the county, with a median household income of $76,808 and a median home value of $247,600. Median household income ranges from $71,868 in 57042 to $106,763 in 57075. Its largest communities include Madison, Lake Madison, Ramona, Brant Lake South and Chester.
Lake County (Census county figures)
| Measure | Census figure |
|---|---|
| Residents | 10,972 |
| Households | 4,716 |
| Median household income | $76,808 |
| Median home value | $247,600 |
| Median age | 43.8 |
| Median rent | $947 |
All 7 ZIP codes together
| Measure | Value |
|---|---|
| Residents (sum of ZIP codes) | 11,128 |
| Households (sum of ZIP codes) | 4,759 |
| Median household income, range across ZIP codes | $71,868 (57042) to $106,763 (57075) |
| Household-weighted average of ZIP medians (an approximation, not a true median) | $77,366 |
| Homeowners | 74.0% |
| Households with kids under 18 | 23.3% |
| Moved in the past year | 14.5% |
| Carrier routes in EDDM2GO's route library | 15 routes, 4,284 homes (5 of 7 ZIP codes) |
Top facts
- Highest median household income in Lake County: 57075 ($106,763)
- Most residents: 57042 (7,756 people)
- Highest homeownership: 57075 (90.5% own their home)
- Most households with kids: 57042 (22.9% of households)
- Most new movers: 57042 (19.4% moved in last year)
- Youngest median age: 57042 (43.1 years)
- Highest median home value: 57075 ($426,800)
Every ZIP code in Lake County
| ZIP | Mailing city | Residents | Households | Median income | Home value | Homeowners | With kids | New movers | Carrier routes | Mailboxes | Why listed |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 57042 | Madison | 7,756 | 3,331 | $71,868 | $228,200 | 67.4% | 22.9% | 19.4% | 10 | 4,032 | 99% of its land |
| 57075 | Wentworth | 1,296 | 623 | $106,763 | $426,800 | 90.5% | 16.9% | 1.6% | — | — | 98% of its land |
| 57054 | Ramona | 703 | 236 | $86,875 | $97,100 | 80.5% | 25.8% | 4.3% | 2 | 139 | 99% of its land |
| 57016 | Chester | 676 | 297 | $95,815 | $242,300 | 94.3% | 17.5% | 3.0% | 1 | 169 | 100% of its land |
| 57076 | Winfred | 325 | 125 | $118,281 | $369,200 | 76.8% | 52.8% | 0.0% | 1 | 120 | 53% of its land |
| 57057 | Rutland | 196 | 64 | $71,500 | $266,700 | 100.0% | 43.8% | 7.7% | — | — | 94% of its land |
| 57050 | Nunda | 176 | 83 | $116,563 | $262,500 | 98.8% | 38.6% | 11.0% | 1 | 62 | 100% of its land |
A ZIP code is listed for Lake 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
- Madison — 6,094 residents · 1 ZIP code
- Lake Madison — 936 residents · 2 ZIP codes
- Ramona — 538 residents · 1 ZIP code
- Brant Lake South — 211 residents · 1 ZIP code
- Chester — 152 residents · 1 ZIP code
- Wentworth — 138 residents · 1 ZIP code
- Brant Lake — 63 residents · 1 ZIP code
- Nunda — 40 residents · 1 ZIP code
- Winfred — 34 residents · 1 ZIP code
- Rustic Acres Colony — 30 residents · 1 ZIP code
- Graceville Colony — 0 residents · 1 ZIP code
- Shannon Colony — 0 residents · 1 ZIP code
Price a mailing to Lake County ZIP codes
EDDM guides
Pick carrier routes on the EDDM route map
Frequently asked questions
- What ZIP codes are in Lake County, SD?
- 57042, 57075, 57054, 57016, 57076, 57057 and 57050. Some cross the county line; the table shows each ZIP's share of land in the county.
- What is the population of Lake County?
- 10,972 residents in 4,716 households (ACS 5-year estimates, 2020–2024).
- What is the median household income in Lake County?
- $76,808 for the county as a whole. Its ZIP codes range from $71,868 (57042) to $106,763 (57075).
- Which Lake County ZIP code has the highest median household income?
- 57075, at $106,763, among ZIP codes with at least 1,000 residents.
- How many carrier routes and mailboxes are in Lake County?
- For the 5 of 7 ZIP codes in EDDM2GO's stored route library: 15 carrier routes reaching 4,284 residential and 240 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.