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County ZIP codes · South Dakota · FIPS 46031

Corson County, SD ZIP Codes

Corson County, South Dakota has 15 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 11 of the residential ones lie mainly in Corson County and 4 mainly in a neighboring county; 10 cross the county line. Median household income ranges from $58,533 in 57638 (Lemmon) to $66,094 in 57656 (Timber Lake) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Corson County?

57601 · Mobridge: $66k57621 · Bullhead: $33k57633 · Isabel: $79k57634 · Keldron: $88k57638 · Lemmon: $59k57639 · Little Eagle: $21k57641 · McIntosh: $84k57642 · McLaughlin: $59k57644 · Meadow: $68k57645 · Morristown: $57k57656 · Timber Lake: $66k57657 · Trail City: –57658 · Wakpala: $23k57659 · Walker: $103k57660 · Watauga: $67k57638576335764457642576415765657601576455766057657576345765857601 · Mobridge: $66k57621 · Bullhead: $33k57633 · Isabel: $79k57634 · Keldron: $88k57638 · Lemmon: $59k57639 · Little Eagle: $21k57641 · McIntosh: $84k57642 · McLaughlin: $59k57644 · Meadow: $68k57645 · Morristown: $57k57656 · Timber Lake: $66k57657 · Trail City: –57658 · Wakpala: $23k57659 · Walker: $103k57660 · Watauga: $67k57638576335764457642576415765657601576455766057657576345765857601 · Mobridge: $66k57621 · Bullhead: $33k57633 · Isabel: $79k57634 · Keldron: $88k57638 · Lemmon: $59k57639 · Little Eagle: $21k57641 · McIntosh: $84k57642 · McLaughlin: $59k57644 · Meadow: $68k57645 · Morristown: $57k57656 · Timber Lake: $66k57657 · Trail City: –57658 · Wakpala: $23k57659 · Walker: $103k57660 · Watauga: $67k576385763357644576425764157656576015764557657
The residential ZIP codes of Corson 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 $58,533 and $66,003.

They carry 15 postal town names.

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

All 15 residential ZIP codes in Corson County

11 ZIP codes lie mainly in Corson County; 4 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Corson County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
57642 McLaughlin 1,969 3 $59k $70k 97%
57633 Isabel 445 1 $79k $70k 44%
57658 Wakpala 319 5 $23k $85k 100%
57621 Bullhead 294 96 $33k – 100%
57639 Little Eagle 290 147 $21k – 100%
57657 Trail City 247 1 – $57k 78%
57641 McIntosh 215 0 $84k $78k 62%
57645 Morristown 184 1 $57k $52k 52%
57634 Keldron 131 1 $88k $152k 100%
57660 Watauga 111 1 $67k $86k 88%
57659 Walker 16 1 $103k – 100%

Partly in Corson County

Residential ZIP codes mainly in another county that reach at least 1% into Corson County, by their share here
In this county
57656 Timber Lake 1,000 3 $66k $86k 36%
57644 Meadow 388 1 $68k $229k 21%
57601 Mobridge 3,422 8 $66k $155k 9%
57638 Lemmon 1,852 2 $59k $101k 5%

Download the 15 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 Corson County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Corson County and in the neighboring counties
ZIPIn CorsonElsewhere
576019%Dewey County 85%; Walworth County 6%
5764297%Sioux County 3%
576385%Perkins County 60%; Adams County 25%; Grant County 5%; Sioux County 5%
5765636%Dewey County 64%
5763344%Ziebach County 34%; Dewey County 21%
5764421%Perkins County 63%; Ziebach County 16%
5765778%Dewey County 22%
5764162%Sioux County 28%; Grant County 10%
5764552%Grant County 27%; Sioux County 21%
5766088%Sioux County 12%

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

Which first three digits do Corson 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 Corson County starts with 576.

Three-digit prefixes of Corson 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 Corson County's
PrefixSectional centerHereAll codes
576 Bismarck, ND (SCF 585) 15 32

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