Welcome to the Costilla County COGenWeb Page!

As a volunteer, I hope to provide you with valuable genealogical resources in your quest for family history information. Thank you for your patience as this site is being renovated. Please feel free to contact me if I can be of any assistance.

Cynthia Martinez Monroe – Costilla County Coordinator • Email me: CmonroeCOGenWeb@gmail.com

A proud part of the The USGenWeb® Project and the COGenWeb Project

Join the Alamosa, CO Genealogy & History Facebook group for inquiries, posts, and sharing: https://www.facebook.com/groups/Alamosa/

Join the Conejos, CO Genealogy & History Facebook group for inquiries, posts, and sharing: https://www.facebook.com/groups/821679600870995

Join the COGenWeb Genealogy & History Facebook group for inquiries, posts, and sharing:: https://www.facebook.com/groups/610976568756220

About Costilla County

Created in 1861, Costilla is Colorado's oldest permanent settlement area and part of the historic San Luis Valley. Parts of the original county later formed Saguache (1866), Rio Grande (1874), and Alamosa (1913) Counties. The county seat has been San Luis since 1867 (earlier: San Miguel). Communities, churches, and local archives remain rich sources for family history.

Costilla County Records & Resources

Church & Vital Records

Cemeteries & Obituaries

Newspapers, Books, & Periodicals

Online Historical Collections

Land, Maps and Homesteads

Social Media, Message Boards and Lookups

Vital Records and Requests

Local History and Research Help

Census, Directories and Archives

1920 Census Images - Costilla County

COGenWeb & USGenWeb

Neighboring County COGenWeb Sites

Alamosa; Archuleta; Conejos; Mineral; Saguache; Rio Grande;

Also check nearby New Mexico counties: Rio Arriba and Taos

COGenWeb Contacts

Costilla County Coordinator - Cynthia Martinez Monroe
COGenWeb State Coordinator - Rebecca Maloney
Assistant State Coordinator - Betty Baker
Assistant State Coordinator - M.D. Monk
Assistant State Coordinator – Norma Hass