| Moore County Texas Cities/Towns - Cactus, Dumas (County Seat), Masterson, Sunray |
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![]() Your Ad Here Moore County is a county located in the U.S. state of Texas. In 2000, its population was 20,121. The county seat is Dumas, which is named for Louis Dumas, originally from the Sherman, Texas, area. History Moore is named for Edwin Ward Moore, the commander of the Texas Navy. ![]() |