ZIP codes in Fremont County
13 ZIPs touch Fremont County, Wyoming. The blue dashed line is the county border; orange ZIPs reach into it.
13
ZIP codes
1
cross the county line
39,533
people in these ZIPs
23
counties in WY
Most people
Fremont County ZIP list
More counties in Wyoming
- Albany County13
- Big Horn County15
- Campbell County9
- Carbon County14
- Converse County5
- Crook County9
- Goshen County12
- Hot Springs County3
- Johnson County5
- Laramie County18
- Lincoln County16
- Natrona County16
Questions people actually ask
How many ZIP codes are in Fremont County, Wyoming?
13 ZIP codes reach into Fremont 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 Fremont County has the most people?
82501 (Riverton) has about 19,413 residents, the most of any ZIP touching Fremont County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Fremont 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 Fremont 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