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Costilla County Assessor

County Assessor Property Search  |  Colorado Division of Property Taxation


Thomas Aragon

County Assessor

P.O. Box 344

San Luis, CO  81152

Phone: (719) 937-7670

eFax: (888) 709-5722


Office Hours:

​Monday - Thursday: 7:00 a.m. - 5:30 p.m.

No closure for lunch.


In an effort to keep our staff safe and reduce the risk of spreading germs, the Costilla County Assessor’s Physical Office is closed to the public until further notice.

Our team is working remotely and is available to answer your questions via telephone.                                  

We are able to respond to you and assist you with any questions you may have if you call or email us, just as if we were in the office.

Please call: (719)-937-7670

Please email:


Thomas Aragon,

Costilla County Assessor


About Our Office

This office is directly responsible for discovering, locating, classifying and valuing properties.  It is the responsibility of this office to update and maintain accurate property records.  These records include improvements and all improvement characteristics, along with pictures of these improvements.  Records also include land size, location, maps and transfer history.


​Thomas Aragon - Assessor

Ronda Lobato - ​Deputy Assessor/Chief Appraiser

Pamela Vigil - ​Office Manager

Steve Valdez - Transfer Clerk

Loryn DeLeon​ - Field Inspector

Angelica Valdez - Field Inspector


Click here for 2019-2020 Reappraisal Information 


​Abstract Brochures







Helpful Links

Department of Local Affairs

Colorado Assessors' Association