 At statehood in 1907, Cimarron County was taken from the western one-third, while Texas County was taken from the middle, leaving Beaver County only in the east.Its borders are now at 100°W (east), 37°N (north), 36.5°N (south), and approximately 100.8°W (west).As of 1903, Beaver County had a sundown town policy prohibiting African Americans from residing there.