Residential delivery area · South Dakota
ZIP Code 57042: Madison, SD
ZIP code 57042 uses the postal name Madison, South Dakota and lies entirely in Lake County (Census 2020 ZIP-county file). About 7,800 people live there (Census Bureau, ACS 2020-2024). Median household income is $71,868 (Census Bureau, ACS 2020-2024). By Census place, its land lies in Madison (2%) and Rustic Acres Colony (under 1%); 97% is outside any Census place.
- ACS2020-24
- Census2020
- FHFA2025
- ZBP2023
- IRS2022
- Town
- Madison · its only residential ZIP
- County
- Lake County
- Census places
- Madison (2%); Rustic Acres Colony (under 1%) census-designated place
- House district
- SD at large 119th Congress
- State
- South Dakota
- Time zone
- Central
- Land area
- 193.2 sq mi · 40 people per sq mi
Where is ZIP code 57042?
57042 centers on 43.971°, -97.144° and covers 193.2 square miles of land plus 3.7 of water. It borders 8 ZIP codes: 57075, 57076, 57016, 57054, 57057, 57050, 57018, 57048.
The map draws ZIP code areas only. For the streets inside 57042, open its center on OpenStreetMap.
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries and the 2023 Gazetteer (2020 ZCTAs); ZIP-to-county shares, Census places and House districts (119th Congress) from the Census 2020 relationship files (shares of land); metro area from the OMB delineation (July 2023); town name and time zone from simplemaps US ZIP Codes (CC BY 4.0).
How does 57042 compare with the rest of Lake County?
| Measure | 57042 | In Lake County | In SD |
|---|---|---|---|
| People (ACS 2020-2024) | 7,756 | 1st of 12 | 28th of 375 |
| Median household income | $72k | 6th of 6 | 67th of 107 |
| Median home value | $228k | 6th of 6 | 58th of 109 |
Its median household income is higher than in 50% of U.S. residential ZIP codes, and it is denser than 38% of all U.S. residential ZIP codes. ZIP codes at the ACS caps ($250,000 or more for household income, $2,000,000 or more for home value) share the top rank.
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B19013, B25077); ranks by PlainZIP over residential ZIP codes (ZCTAs).
How many people live in 57042?
The 2020 Census counted 8,131 people in 57042; the ACS, which samples households over 2020-2024, estimates 7,756. Between the 2010 and 2020 censuses its population fell 3.4% (its boundary stayed at least 90% the same).
- People, ACS 2020-2024
- 7,756
- 2020 Census count
- 8,131−3.4% since 2010 (8,415)
- Households
- 3,331
- Median age
- 43.1
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01003, B01002, B11001); 2020 Census (DHC P1); 2010 Census (SF1 P1).
Who lives in 57042?
Of the 7,756 people the ACS estimates in 57042, 18.4% are under 18 and 23.6% are 65 or older. The largest group by race and Hispanic origin is White (not Hispanic) (92.5%).
- Under 1818.4%
- 18 to 6458.0%
- 65 and older23.6%
- White, not Hispanic92.5%
- Hispanic or Latino3.4%
- Other or two or more2.1%
- Black, not Hispanic1.0%
- Asian, not Hispanic1.0%
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B01001 age by sex, B03002 Hispanic or Latino origin by race); shares of the estimated population, small ZIP codes carry wide margins.
What do households in 57042 earn?
Median household income is $71,868 (ACS 2020-2024), the 6th highest of the 6 ranked ZIP codes in Lake County. It is not measurably different from 2015-2019 ($73,476 in 2024 dollars): the change is within the surveys' margins of error.
- Median household income
- $71,868±$8,353
- Income per person
- $39,812
- Below the poverty line
- 8.1%
- Unemployed (of the labor force)
- 3.9%
- Adults 25+ with a bachelor's degree
- 36.6%
- Adjusted gross income per tax return, 2022
- $78,8793,990 returns; wages 60% of AGI (IRS)
Source: U.S. Census Bureau, ACS 2020-2024 and 2015-2019 5-year estimates (B19013, B19301, B17001, B23025, B15003; 2015-2019 dollars converted with the BLS CPI-U, 1.22699); IRS Statistics of Income, ZIP code data, tax year 2022 (adjusted gross income per return, filed under the address on the return).
What are homes worth in 57042?
FHFA's house price index for 57042, built from repeat sales and appraisals of the same homes, rose 106% from 2015 to 2025 and rose 61% from 2020 to 2025, and moved +4.9% in 2025.
- Median home value (owners' estimate)
- $228,200
- Median gross rent
- $963
- Homes owned by their occupants
- 67.4%
- Housing units
- 3,800
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B25077, B25064, B25003, B25001); FHFA House Price Index, annual five-digit ZIP, updated 2026-03-31.
What businesses are in 57042?
272 business establishments had a location in this ZIP code in 2023, 43 fewer than in 2018; the most are in retail trade (ZIP Code Business Patterns).
- Retail trade35
- Accommodation and food services28
- Construction26
- Other services (except public administration)26
- Finance and insurance25
- Professional, scientific, and technical services24
Source: U.S. Census Bureau, ZIP Code Business Patterns 2023 and 2018 (establishments with paid employees, by the business's ZIP code).
Which ZIP codes are next to 57042?
| ZIP | Town | People | Household income | Distance |
|---|---|---|---|---|
| 57075 | Wentworth | 1,296 | $107k | 9.0 mi |
| 57076 | Winfred | 325 | $118k | 10.7 mi |
| 57016 | Chester | 676 | $96k | 11.3 mi |
| 57054 | Ramona | 703 | $87k | 11.6 mi |
| 57057 | Rutland | 196 | $72k | 12.9 mi |
| 57050 | Nunda | 176 | $117k | 14.2 mi |
| 57018 | Colton | 1,495 | $98k | 14.5 mi |
| 57048 | Montrose | 1,237 | $84k | 16.1 mi |
Source: PlainZIP from the Census 2020 ZCTA boundaries (shared edges) and internal points; figures ACS 2020-2024.