Wellston, OH has a population of 5,595 and is the 6,013th largest city in the United States. The population density is 803 per sq mi which is 212% higher than the Ohio average and 786% higher than the national average. The median age in Wellston is 38 which is approximately 2% lower than the Ohio average of 39. In Wellston, 62% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 85% of Wellston residents were born in Ohio, 14% were born out of state, 0% were born outside of the United States and 0% were foreign born.