ZIP codes in Routt County
13 ZIPs touch Routt County, Colorado. The blue dashed line is the county border; orange ZIPs reach into it.
13
ZIP codes
5
cross the county line
37,488
people in these ZIPs
64
counties in CO
Most people
Routt County ZIP list
More counties in Colorado
- Phillips County4
- Pitkin County8
- Prowers County6
- Pueblo County20
- Rio Blanco County4
- Rio Grande County5
- Saguache County9
- San Juan County2
- San Miguel County7
- Sedgwick County4
- Summit County5
- Teller County8
Questions people actually ask
How many ZIP codes are in Routt County, Colorado?
13 ZIP codes reach into Routt County, including 2 PO Box or single-address ZIPs placed by the town they serve. 5 of them are only partly in the county and also cover a neighboring county.
Which ZIP code in Routt County has the most people?
80487 (Steamboat Springs) has about 18,525 residents, the most of any ZIP touching Routt County, in the Census Bureau’s ACS 2020–2024 estimates.
Can a ZIP code be in Routt 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 Routt 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