Costilla County Colorado Property Search
To search Costilla County property records, use the tool below by owner name, parcel number, or street address. Costilla County sits in the eastern San Luis Valley along the New Mexico border, and its county seat, San Luis, is the oldest continuously occupied town in Colorado, founded in 1851. Much of the county lies within the historic Sangre de Cristo Land Grant, so property records here trace back to Spanish and Mexican land grants. It’s a small, rural county with about 2,910 residential and 130 commercial properties and a low effective 2025 property tax rate of about 0.36%. Records are kept by the Costilla County Assessor in San Luis.
Property Search
Partial info works — a last name or street name is enough.
Note: Results come from Colorado’s public GIS database and may not reflect the most recent changes. For verified records, contact the county assessor directly.
How Property Is Assessed in Costilla County
The Costilla County Assessor values residential, agricultural, and vacant land on Colorado’s two-year reappraisal cycle. Land-grant history shapes assessment here in a way it doesn’t in most counties: many parcels descend from the 1843 Sangre de Cristo Land Grant, and traditional farming and ranching uses established generations ago still qualify for agricultural classification — which values land on production rather than market price, usually lowering the assessment. The Assessor verifies that agricultural use before applying the classification. Read more about how Colorado assessments work.
Each parcel has a unique parcel number, which is the fastest and most accurate way to pull up ownership, land size, building details, and tax records. Use our property tax calculator for a quick estimate.
Assessor’s Office — Contact & Key Dates
San Luis, CO 81152
San Luis, CO 81152
Early June — real property appeals are generally due. Confirm the exact date each year with the Assessor before filing.
If your appeal is denied, you can petition the County Board of Equalization.
4 Ways to Find a Property Record
Full or partial name — shows all parcels registered under one owner.
Unique ID on your tax statement or deed. Fastest and most accurate method.
Enter the address to pull current owner, parcel data, and assessed value.
Filter to San Luis, Fort Garland, or Blanca to browse an area.
Property Tax by Community
| Community | Population (approx.) | Median tax bill | Effective rate |
|---|---|---|---|
| Fort Garland | ~433 | ~$771 | ~0.53% |
| San Luis (county seat) | ~629 | ~$207 | ~0.42% |
| Blanca | ~385 | ~$329 | ~0.56% |
| Jaroso | ~35 | ~$231 | ~0.40% |
| San Pablo | ~140 | ~$162 | ~0.54% |
| Chama | ~170 | ~$118 | ~0.41% |
These figures are estimates for research; confirm exact amounts with the Costilla County Treasurer.
Exemptions & Tax Relief
Homeowners 65 or older who have owned and lived in their home for 10 consecutive years can have 50% of the first $200,000 of value exempted. Apply with the Assessor. Find out who qualifies for the senior exemption.
Veterans with a 100% permanent service-connected disability get the same 50% exemption on the first $200,000, regardless of age. Surviving spouses may qualify. See all veteran property tax benefits.
Given the county’s land-grant farming and ranching heritage, agricultural classification is common and important — it values land on production rather than market value. The Assessor verifies the agricultural use before applying it.