County GIS · State lines · October 20, 2026
Colorado–Utah Border Counties: Parcel Maps on Both Sides
All 12 counties on the Colorado–Utah line, with seats, 2023 populations and a link to each official parcel map, plus what changes at the state line.
Looking for the counties on the Colorado–Utah border and their parcel maps? According to the Census Bureau's county adjacency file, 8 Colorado counties touch 4 Utah counties along the line. Each one keeps its own property records and its own parcel viewer, so land near the line often means checking two counties in two states.
A farm, hunting tract or lake lot can sit in one state while the road, the neighbors or the rest of the property are in the other. This page lists every county that touches the line on either side, with links to each official parcel map.
Colorado–Utah border at a glance
- Counties on the line: 12 (8 in Colorado, 4 in Utah)
- With a verified public parcel viewer in our directory: 12 of 12
- Residents, 2023 estimates: about 323,352 on the Colorado side and 62,803 on the Utah side
- Most populous on each side: Mesa County, CO (159,681) and Uintah County, UT (37,747)
- Largest by land area: Moffat County, CO (4,743 sq mi) and San Juan County, UT (7,820 sq mi)
Colorado counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Dolores County | Dove Creek | 1,067 | 2,513 | ArcGIS Web AppBuilder |
| Garfield County | Glenwood Springs | 2,947 | 62,707 | county web map |
| Mesa County | Grand Junction | 3,329 | 159,681 | county web map |
| Moffat County | Craig | 4,743 | 13,327 | ArcGIS Instant Apps |
| Montezuma County | Cortez | 2,029 | 26,531 | Colorado Public Parcel Map |
| Montrose County | Montrose | 2,241 | 44,156 | county web map |
| Rio Blanco County | Meeker | 3,221 | 6,569 | Colorado Public Parcel Map |
| San Miguel County | Telluride | 1,287 | 7,868 | Colorado Public Parcel Map |
Utah counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Daggett County | Manila | 697 | 992 | ArcGIS Web AppBuilder |
| Grand County | Moab | 3,673 | 9,706 | ArcGIS Web AppBuilder |
| San Juan County | Monticello | 7,820 | 14,358 | Utah State Parcels viewer |
| Uintah County | Vernal | 4,482 | 37,747 | ArcGIS Web AppBuilder |
Which counties face each other
Here is who borders whom across the line, based on the Census Bureau adjacency file:
- Dolores County, CO borders San Juan County, UT
- Garfield County, CO borders Grand County, UT, Uintah County, UT
- Mesa County, CO borders Grand County, UT, San Juan County, UT
- Moffat County, CO borders Daggett County, UT, Uintah County, UT
- Montezuma County, CO borders San Juan County, UT
- Montrose County, CO borders Grand County, UT, San Juan County, UT
- Rio Blanco County, CO borders Uintah County, UT
- San Miguel County, CO borders San Juan County, UT
What changes when you cross the line
- Different viewers. On the Colorado side the official maps run on: county web map (3); Colorado Public Parcel Map (3); ArcGIS Web AppBuilder (1); ArcGIS Instant Apps (1). On the Utah side: ArcGIS Web AppBuilder (3); Utah State Parcels viewer (1). Search boxes, parcel ID formats and the details shown in pop-ups will differ.
- Different records offices. Deeds, plats and tax bills are kept by the county where the parcel sits.
- Different rules. Zoning, septic permits and property tax are set locally and by each state, so check with the county on the side where you plan to build or buy.
Researching a tract that crosses the line
- Find the parcel in both counties' viewers. Each side will show only its own piece, with its own parcel number.
- Pull the recorded deed from each county's register or recorder, since each county records only the land inside its own boundary.
- Expect two tax bills, one from each county, and check each state's rules for homestead or farm exemptions.
- For a sale, a fence or a building permit, hire a licensed surveyor familiar with the line; tax-map lines are drawings, not surveys.
A quick way to check which side a spot is on
Open the Platbookmapper Land Map, search the nearest county, and tap the spot. The land report shows which county it falls in, along with flood zone, elevation, soil and wetlands, and links to that county's parcel map.
Related guides
More: Colorado counties · Utah counties
Sources
- U.S. Census Bureau county adjacency file, used for which counties share the line.
- U.S. Census Bureau Gazetteer files, 2020 county land area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 20, 2026) for each county's official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.