https://en.wikipedia.org/wiki/Odessa,_Texas Odessa was founded in 1881 as a water stop and cattle-shipping point on the Texas and Pacific Railway. The first post office opened in 1885. Odessa became the county seat of Ector County in 1891 when the county was first organized. It was incorporated as a city in 1927, after oil was discovered in Ector County on the Connell Ranch southwest of Odessa.[9] With the opening of the Penn Field in 1929, and the Cowden Field in 1930, oil became a major draw for new residents. In 1925, the population was just 750; by 1929, it had risen to 5,000. For the rest of the 20th century, the city's population and economy grew rapidly during each of a succession of oil booms (roughly in the 1930s–1950s, 1970s, and 2010s), often with accompanying contractions during the succeeding busts (particularly in the 1960s and 1980s).[9]