Fort Davisbr/Jeff Davis County, Texasbr/30 35.250' N 103 53.683' Wbr/Directions: Start at the intersection of SH-17 and SH-118. The marker is in the intersection triangle.br/ br/Text: Formed from Presidio County. Created March 15, 1887. Organized May 16, 1887. Named in honor of Jefferson David 1808-1868. President of the Confederate States. Fort Davis , county seat, Presidio County 1875. County seat, Jeff Davis County since 1887.