Oil was discovered near Wynona in 1914, and led to the creation of Wynona Oil and Gas Company. This caused an influx of new residents to support the local oil industry. Wynona's 1920 census reported 2,749 inhabitants. Wynona remained important for its agriculture and ranching business. Ranchers diversified into producing hogs, poultry and dairy products. However, the town failed to put in electric service and paved streets, causing some businessmen to move elsewhere. The end of the boom in Osage County oil production and the onset of the Great Depression caused the population to decline sharply to 1,171 in 1930 and to 652 in 1960. The MK&T abandoned its rail line in 1977.
Oil was discovered near Wynona in 1914, and led to the creation of Wynona Oil and Gas Company. This caused an influx of new residents to support the local oil industry Wynona's 1920 census reported 2,749 inhabitants. Wynona remained important for its agriculture and ranching business. Ranchers diversified into producing hogs, poultry and dairy products. However, the town failed to put in electric service and paved streets, causing some businessmen to move elsewhere. The end of the boom in Osage County oil production and the onset of the Great Depression caused the population to decline sharply to 1,171 in 1930 and to 652 in 1960. The MK&T abandoned its rail line in 1977.