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County ZIP codes · Wyoming · FIPS 56011

Crook County, WY ZIP Codes

Crook County, Wyoming has 10 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Crook County and 3 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $72,865 in 82721 (Moorcroft) to $77,689 in 57717 (Belle Fourche) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Crook County?

57717 · Belle Fourche: $78k82710 · Aladdin: $54k82711 · Alva: $59k82712 · Beulah: –82714 · Devils Tower: –82720 · Hulett: $80k82721 · Moorcroft: $73k82727 · Rozet: $98k82729 · Sundance: $89k82730 · Upton: $72k57717827308272182720827298272782710827118271257717 · Belle Fourche: $78k82710 · Aladdin: $54k82711 · Alva: $59k82712 · Beulah: –82714 · Devils Tower: –82720 · Hulett: $80k82721 · Moorcroft: $73k82727 · Rozet: $98k82729 · Sundance: $89k82730 · Upton: $72k5771782730827218272082729827278271057717 · Belle Fourche: $78k82710 · Aladdin: $54k82711 · Alva: $59k82712 · Beulah: –82714 · Devils Tower: –82720 · Hulett: $80k82721 · Moorcroft: $73k82727 · Rozet: $98k82729 · Sundance: $89k82730 · Upton: $72k57717827308272182720827298272782710
The residential ZIP codes of Crook 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?

They carry 10 postal town names.

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

All 10 residential ZIP codes in Crook County

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

Residential ZIP codes mainly in Crook County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
82721 Moorcroft 2,955 4 $73k $277k 100%
82729 Sundance 2,331 4 $89k $308k 94%
82720 Hulett 995 2 $80k $246k 100%
82711 Alva 254 3 $59k – 100%
82710 Aladdin 246 1 $54k $489k 100%
82714 Devils Tower 196 9 – – 100%
82712 Beulah 163 2 – $2M+ 100%

Partly in Crook County

Residential ZIP codes mainly in another county that reach at least 1% into Crook County, by their share here
In this county
57717 Belle Fourche 8,983 7 $78k $249k 15%
82730 Upton 1,422 2 $72k $194k 10%
82727 Rozet 2,040 5 $98k $344k 5%

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?

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

Share of each ZIP code's land in Crook County and in the neighboring counties
ZIPIn CrookElsewhere
5771715%Butte County 65%; Carter County 10%; Harding County 9%
8272994%Weston County 6%
827275%Campbell County 95%
8273010%Weston County 90%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Crook County's ZIP codes use 2 prefixes: 577 and 827.

Three-digit prefixes of Crook 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 Crook County's
PrefixSectional centerHereAll codes
577 Rapid City, SD (SCF 577) 1 58
827 Casper, WY (SCF 826) 9 18

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