In
Val Verde County, Comstock is located north of
Del Rio on US 90 near Armistad International Reservoir (US-Mexico) and Armistad National Recreation Area.
About 6,000 years ago prehistoric people lived in the nearby caves and rockshelters. They left behind caches of seeds, bits of clothing, tools, burial sites, and cave art. Modern settlement of the area began in the 1800s and was aided by the advent of the railroad, now the Southern Pacific Railroad.
By the 1950s it had five businesses and a population of 300; in the early 1990s Comstock had twelve businesses and a population of 375.