Midland County again led the state with 14.119 million barrels, or 13.51 percent of the 104.455 million barrels produced in September, according to the RRC. Midland and Martin County were Nos. 1 and 2 in the state, accounting for 25.88 percent of all oil produced. The RRC reported 12.96 million barrels were produced in Martin County during the month of September.