Plain

County ZIP codes · Wyoming · FIPS 56037

Sweetwater County, WY ZIP Codes

Sweetwater County, Wyoming has 13 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 12 residential and 1 for PO boxes or a single organization. 11 of the residential ones lie mainly in Sweetwater County and 1 mainly in a neighboring county; 1 cross the county line. Median household income ranges from $62,841 in 82301 (Rawlins) to $87,993 in 82935 (Green River) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Sweetwater County?

82301 · Rawlins: $63k82322 · Bairoil: $40k82336 · Wamsutter: $57k82901 · Rock Springs: $70k82929 · Little America: –82932 · Farson: $88k82934 · Granger: $83k82935 · Green River: $88k82938 · McKinnon: $105k82942 · Point Of Rocks: –82943 · Reliance: –82945 · Superior: $68k823018290182932823368293582938829458294382301 · Rawlins: $63k82322 · Bairoil: $40k82336 · Wamsutter: $57k82901 · Rock Springs: $70k82929 · Little America: –82932 · Farson: $88k82934 · Granger: $83k82935 · Green River: $88k82938 · McKinnon: $105k82942 · Point Of Rocks: –82943 · Reliance: –82945 · Superior: $68k8230182901829328233682935829388294582301 · Rawlins: $63k82322 · Bairoil: $40k82336 · Wamsutter: $57k82901 · Rock Springs: $70k82929 · Little America: –82932 · Farson: $88k82934 · Granger: $83k82935 · Green River: $88k82938 · McKinnon: $105k82942 · Point Of Rocks: –82943 · Reliance: –82945 · Superior: $68k823018290182932823368293582938
The residential ZIP codes of Sweetwater 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 12 postal town names.

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

All 12 residential ZIP codes in Sweetwater County

11 ZIP codes lie mainly in Sweetwater County; 1 more reaches into it from a neighboring county and follows the first table.

Residential ZIP codes mainly in Sweetwater County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
82901 Rock Springs 27,198 25 $70k $249k 100%
82935 Green River 12,012 89 $88k $263k 100%
82932 Farson 997 6 $88k – 100%
82934 Granger 285 40 $83k $117k 100%
82336 Wamsutter 269 1 $57k $99k 100%
82938 McKinnon 221 1 $105k $437k 100%
82945 Superior 196 3 $68k – 100%
82943 Reliance 187 5 – – 100%
82322 Bairoil 149 28 $40k $24k 100%
82929 Little America 19 6 – – 100%
82942 Point Of Rocks 9 1 – – 100%

Partly in Sweetwater County

Residential ZIP codes mainly in another county that reach at least 1% into Sweetwater County, by their share here
In this county
82301 Rawlins 8,180 9 $63k $217k 36%

Download the 13 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?

1 ZIP code of Sweetwater County extends into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Sweetwater County and in the neighboring counties
ZIPIn SweetwaterElsewhere
8230136%Carbon County 64%

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

PO Box and single-organization ZIP codes

ZIP codes in Sweetwater County without a residential area (GeoNames postal codes)
ZIPPostal name
82902Rock Springs

Source: GeoNames postal codes (CC BY 4.0).

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Sweetwater County's ZIP codes use 2 prefixes: 823 and 829.

Three-digit prefixes of Sweetwater 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 Sweetwater County's
PrefixSectional centerHereAll codes
823 Cheyenne, WY (SCF 820) 3 14
829 Salt Lake City, UT (SCF 840) 10 21

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