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County ZIP codes · South Dakota · FIPS 46079

Lake County, SD ZIP Codes

Lake County, South Dakota has 12 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Lake County and 5 mainly in a neighboring county; 8 cross the county line. Median household income ranges from $71,868 in 57042 (Madison) to $106,763 in 57075 (Wentworth) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Lake County?

57016 · Chester: $96k57018 · Colton: $98k57022 · Dell Rapids: $101k57042 · Madison: $72k57050 · Nunda: $117k57051 · Oldham: $56k57054 · Ramona: $87k57057 · Rutland: $72k57058 · Salem: $84k57071 · Volga: $77k57075 · Wentworth: $107k57076 · Winfred: $118k57022570425705857054570715707657051570185707557050570165705757016 · Chester: $96k57018 · Colton: $98k57022 · Dell Rapids: $101k57042 · Madison: $72k57050 · Nunda: $117k57051 · Oldham: $56k57054 · Ramona: $87k57057 · Rutland: $72k57058 · Salem: $84k57071 · Volga: $77k57075 · Wentworth: $107k57076 · Winfred: $118k57022570425705857054570715707657051570185707557050570165705757016 · Chester: $96k57018 · Colton: $98k57022 · Dell Rapids: $101k57042 · Madison: $72k57050 · Nunda: $117k57051 · Oldham: $56k57054 · Ramona: $87k57057 · Rutland: $72k57058 · Salem: $84k57071 · Volga: $77k57075 · Wentworth: $107k57076 · Winfred: $118k570225704257058570545707157076570515701857075570505701657057
The residential ZIP codes of Lake County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024). <$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $77,138 and $97,500.

They carry 12 postal town names.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 12 residential ZIP codes in Lake County

7 ZIP codes lie mainly in Lake County; 5 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Lake County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
57042 Madison 7,756 40 $72k $228k 99%
57075 Wentworth 1,296 16 $107k $427k 98%
57054 Ramona 703 6 $87k $97k 99%
57016 Chester 676 26 $96k $242k 100%
57076 Winfred 325 3 $118k $369k 53%
57057 Rutland 196 6 $72k $267k 94%
57050 Nunda 176 4 $117k $263k 100%

Partly in Lake County

Residential ZIP codes mainly in another county that reach at least 1% into Lake County, by their share here
In this county
57071 Volga 3,149 26 $77k $246k 6%
57051 Oldham 163 2 $56k $113k 5%
57018 Colton 1,495 18 $98k $253k 4%
57022 Dell Rapids 5,339 38 $101k $325k 3%
57058 Salem 1,881 12 $84k $229k 3%

Download the 12 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

10 ZIP codes of Lake County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Lake County and in the neighboring counties
ZIPIn LakeElsewhere
5704299%
570223%Minnehaha County 51%; Moody County 46%
570716%Brookings County 92%; Moody County 2%
570583%McCook County 96%; Miner County 2%
570184%Minnehaha County 96%
5707598%Moody County 2%
5705499%
5707653%Miner County 47%
5705794%Moody County 6%
570515%Kingsbury County 78%; Miner County 18%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

Which first three digits do Lake County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Lake County starts with 570.

Three-digit prefixes of Lake County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Lake County's
PrefixSectional centerHereAll codes
570 Sioux Falls, SD (SCF 570) 12 69

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.