OILLA, TEXAS. Oilla is on the Southern Pacific line twelve miles east of Beaumont in central Orange County. Ernest Williams and Robert Walles owned the tract and drew up a town plat in 1913, probably naming the town in reference to a recent discovery of oil in central Orange County at the Kishi settlement. The Oilla post office opened in 1913. Though Oilla was the site of the Rush-Daniel Lumber Company and was on the important Texas and New Orleans Railroad, it had a population of only twelve in 1920. By the 1970s, scattered residential development had marked the area.