Maps... or Where is Culberson County?         
How far is it?  Texas mileage calculator
New Maps!
(both include area that became Culberson County in 1912)
Texas Census County Formation Maps from segenealogy.com
Culberson County was formed in 1912 from El Paso County, so if you're looking for old maps, look for El Paso County.
Lots of Texas Maps Perry-Castaņeda Library Map Collection at the UT Library Online
Texas 1887, USGenWeb Map Collection
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Rootsweb County Locator Know the town, find the county
Culberson County