 About 14.10% of families and 15.00% of the population were below the poverty line, including 17.10% of those under age 18 and 19.60% of those age 65 or over.The Texas Constitution requires that Jeff Davis and all other Texas counties regardless of area or population be governed by a five-member Commissioners Court which exercises power and jurisdiction over all county business.The Commissioners Court is composed of the County Judge as presiding officer, and four County Commissioners elected to four-year terms from single-member precincts.