County · code 08105
Rio Grande CountyColorado
Rio Grande County is a county in Colorado with its seat in Del Norte, formed in 1874.
- Founded1874
- County seatDel Norte
- Named forRio Grande
- Land area912 sq mi + 0.4 sq mi water
- Population11,539 2020 Census
- Parcels mapped13,171 checked 16 October 2026
Where it is
Rio Grande on the map of Colorado
Colorado has 64 counties and county equivalents, each with its own records office. Shapes with a page are links.
History
Formed in 1874 from Conejos County and Costilla County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Rio Grande County was created by Colorado Territory in 1874 from Conejos and Costilla counties. The county was named after the Rio Grande. In 1879, Rio Grande exchanged territory with Saguache County, and in 1893 it lost area to the creation of Mineral County.
- 1874Rio Grande County created Rio Grande created by Colorado Territory from Conejos and Costilla. · Colo. Terr. Laws 1874, 10th sess., sec. 1/p. 66
- 1879Exchanged territory Rio Grande exchanged with Saguache. · Colo. Laws 1879, 2d sess., p. 48
- 1893Lost territory Rio Grande lost to creation of Mineral. · Colo. Laws 1893, 9th sess., ch. 52, pp. 94-97; Colo. Laws 1895, 10th sess., ch. 92, pp. 205-206
Land and parcels
What the maps cover in Rio Grande
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 13,171 parcels. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
checked 16 October 2026 -
Address points Missing
No public address points layer found for Rio Grande County yet.
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Buildings Reference
Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026
- Official
- from the office that keeps the record
- Good enough
- a reliable statewide or national copy
- Fallback
- a guide only; check the official record
- Missing
- nothing public found yet
People and land
Rio Grande by the Census
Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.
Rules and offices
Rio Grande County's official site
We have found the county's site but not its offices yet; start there.
County government
- County government
The official website of Rio Grande County.
See your own lot on these maps
Open Rio Grande County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.
Questions
Common questions about Rio Grande County
- When was Rio Grande County founded?
- Rio Grande County was founded in 1874, formed from Conejos County and Costilla County, and named after Rio Grande.
- What is the county seat of Rio Grande County?
- The county seat of Rio Grande County is Del Norte.
- Is there an online parcel map for Rio Grande County?
- Yes. A public source publishes a parcel map of 13,171 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Rio Grande County's boundary or name changed?
- Rio Grande County was created in 1874 from Conejos County and Costilla County. Since then the Atlas of Historical County Boundaries records 2 later changes, chiefly involving Mineral County and Saguache County.
- Is my lot in a flood zone?
- We do not have flood maps for Rio Grande County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby