Wellington, OH has a population of 5,063 and is the 6,417th largest city in the United States. The population density is 1,396 per sq mi which is 442% higher than the Ohio average and 1440% higher than the national average. The median age in Wellington is 38 which is approximately 4% lower than the Ohio average of 39. In Wellington, 58% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 84% of Wellington residents were born in Ohio, 14% were born out of state, 0% were born outside of the United States and 1% were foreign born.