ZIP codes in Sweetwater County
13 ZIPs touch Sweetwater County, Wyoming. The blue dashed line is the county border; orange ZIPs reach into it.
13
ZIP codes
1
cross the county line
49,722
people in these ZIPs
23
counties in WY
Most people
Sweetwater County ZIP list
More counties in Wyoming
- Natrona County16
- Niobrara County7
- Park County8
- Platte County5
- Sheridan County13
- Sublette County6
- Teton County10
- Uinta County7
- Washakie County2
- Weston County5
Questions people actually ask
How many ZIP codes are in Sweetwater County, Wyoming?
13 ZIP codes reach into Sweetwater County, including 1 PO Box or single-address ZIPs placed by the town they serve. 1 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Sweetwater County has the most people?
82901 (Rock Springs) has about 27,198 residents, the most of any ZIP touching Sweetwater County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Sweetwater County and another county?
Yes. ZIP codes follow mail routes, not county lines. Rows marked with a percentage show how much of that ZIP’s land is in Sweetwater County. For one address, pin the exact spot on the ZIP finder to see its county.
Where does this list come from?
ZIP areas and their county overlaps come from the Census Bureau’s 2020 ZIP Code Tabulation Area to county relationship file. PO Box ZIPs have no area, so each is placed in the county of the ZIP area nearest the town it serves.
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Updated 2026-11-10 · Where the data comes from