Costilla County, founded in the year 1861, was named for Costilla River. It has the county seat and the largest city in San Luis, the oldest town in Colorado. With a total area of 1,230sq mi, it consists of over 3.6K people with enriched racial makeup including White, Native American, black or African American, Asian, Hispanic or Latino, Pacific Islander, and others along with more than 1.5K households and 1K families.

The well streamlined search index of the Costilla County index houses a huge collection of information both public and vital that are significant for the all encompassing genealogical study and practice therewith. The huge database of this site carries data and information on immigration details, civil war records, marriage, divorce decree, death and obituary news, census figures and civil court case lookups, last will and testament reports, origin data, land assessment deeds, and martial service with lots of added data that can be retrieved quite comfortably with a few clicks on the mouse.