Oneonta, AL has a population of 6,645 and is the 5,368th largest city in the United States. The population density is 422 per sq mi which is 359% higher than the Alabama average and 366% higher than the national average. The median age in Oneonta is 41 which is approximately 5% higher than the Alabama average of 39. In Oneonta, 69% of the population over 15 years of age are married, 80% speak English and 18% speak Spanish. 75% of Oneonta residents were born in Alabama, 11% were born out of state, 1% were born outside of the United States and 13% were foreign born.