Reviewed and updated October 9, 2026 by the SearchSystems.net editorial team. The jail figures are from the Vera Institute of Justice's Incarceration Trends data. Every office link was opened and checked against the office's own site between September 23, 2026 and October 2, 2026.
Costilla County, Colorado, has about 3,700 residents (2024 Census Bureau estimate). A person kept in custody after an arrest in Costilla County is held at the county jail, run by the Costilla County Sheriff's Office, and the jail's record of each person held is a public record. This guide says where to look for someone in custody, what the jail holds and who books people into it.
This guide covers the search, the jail, who books people, state prison and common questions.
Related guides: Costilla County public records, Costilla County arrest records, Costilla County warrants, Costilla County criminal records, Costilla County court records, Colorado arrest records and Colorado inmate search.
Finding Someone in Custody in Costilla County
The county jail, run by the Costilla County Sheriff's Office, holds everyone kept in custody after an arrest in Costilla County, from every agency.
SearchSystems opened and checked the jail page of the Costilla County Sheriff's Office at costillacounty.gov/sheriff (page title: Sheriff | Costilla County CO), phone 719-672-0673, 352 Main Street, San Luis, CO 81152, a site that blocks automated checks (HTTP 403), so open it in a browser.
That page is the office's jail information page rather than a roster, so a search for a particular person goes through the office at 719-672-0673.
The Costilla County Jail by the Numbers
On an average day in 2021 the jail held about 21 people, up from about 20 in 2019. Its rated capacity in 2021 was 23 beds, and it ran at 91 percent of it that year. The figures are from the Vera Institute of Justice's Incarceration Trends data.
Costilla County has about 3,700 residents (2024 Census Bureau estimate), so the jail holds about 56 people for every 10,000 residents.
Who Books People Into the Costilla County Jail
The Costilla County Sheriff's Office makes the arrests that end in a booking in Costilla County.
The counts, agency by agency and year by year, are in Costilla County arrest records.
From the Jail to State Prison
The jail holds people awaiting trial and people serving short sentences. A person sentenced to prison in Costilla County serves the sentence in a facility of the Colorado Department of Corrections, whose inmate locator is at cdoc.colorado.gov.
Frequently Asked Questions
How do I find an inmate in Costilla County?
Ask the Costilla County Sheriff's Office at 719-672-0673; its jail page SearchSystems verified is at costillacounty.gov/sheriff.
How many people are in the Costilla County jail?
About 21 on an average day in 2021, the latest year in the Vera Institute's jail data, against a rated capacity of 23 beds.
What is the phone number for the Costilla County jail?
719-672-0673, the number on the page of the Costilla County Sheriff's Office SearchSystems verified.
Where do people sentenced to prison in Costilla County go?
To a facility of the Colorado Department of Corrections; its inmate locator is at cdoc.colorado.gov.
Is this the official Costilla County website?
No. SearchSystems.net is an independent public records guide, online since 1997. It links to the official county, court and state offices described above and does not hold records, charge for them or take requests.