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County ZIP codes · South Dakota · FIPS 46041

Dewey County, SD ZIP Codes

Dewey County, South Dakota has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Dewey County and 3 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $43,235 in 57625 (Eagle Butte) to $66,094 in 57656 (Timber Lake) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Dewey County?

57442 · Gettysburg: $66k57601 · Mobridge: $66k57625 · Eagle Butte: $43k57630 · Glencross: –57633 · Isabel: $79k57636 · Lantry: $112k57652 · Ridgeview: $19k57656 · Timber Lake: $66k57657 · Trail City: –57661 · Whitehorse: $55k5762557633574425765657601576575765257630576615763657442 · Gettysburg: $66k57601 · Mobridge: $66k57625 · Eagle Butte: $43k57630 · Glencross: –57633 · Isabel: $79k57636 · Lantry: $112k57652 · Ridgeview: $19k57656 · Timber Lake: $66k57657 · Trail City: –57661 · Whitehorse: $55k57625576335744257656576015765757652576305766157442 · Gettysburg: $66k57601 · Mobridge: $66k57625 · Eagle Butte: $43k57630 · Glencross: –57633 · Isabel: $79k57636 · Lantry: $112k57652 · Ridgeview: $19k57656 · Timber Lake: $66k57657 · Trail City: –57661 · Whitehorse: $55k57625576335744257656576015765757652
The residential ZIP codes of Dewey 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 $43,235 and $66,003.

They carry 10 postal town names.

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

All 10 residential ZIP codes in Dewey County

7 ZIP codes lie mainly in Dewey County; 3 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Dewey County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
57625 Eagle Butte 3,775 3 $43k $68k 77%
57601 Mobridge 3,422 8 $66k $155k 85%
57656 Timber Lake 1,000 3 $66k $86k 64%
57652 Ridgeview 265 1 $19k – 100%
57661 Whitehorse 177 6 $55k – 100%
57636 Lantry 104 5 $112k $109k 100%
57630 Glencross 11 0 – – 100%

Partly in Dewey County

Residential ZIP codes mainly in another county that reach at least 1% into Dewey County, by their share here
In this county
57657 Trail City 247 1 – $57k 22%
57633 Isabel 445 1 $79k $70k 21%
57442 Gettysburg 1,772 3 $66k $135k 14%

Download the 10 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?

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

Share of each ZIP code's land in Dewey County and in the neighboring counties
ZIPIn DeweyElsewhere
5762577%Ziebach County 23%
5760185%Corson County 9%; Walworth County 6%
5744214%Potter County 84%; Sully County 2%
5765664%Corson County 36%
5763321%Corson County 44%; Ziebach County 34%
5765722%Corson County 78%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Dewey County's ZIP codes use 2 prefixes: 574 and 576.

Three-digit prefixes of Dewey 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 Dewey County's
PrefixSectional centerHereAll codes
574 Dakota Central, SD (SCF 572) 1 50
576 Bismarck, ND (SCF 585) 9 32

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