South Euclid, OH has a population of 21,865 and is the 1,991st largest city in the United States. The population density is 4,702 per sq mi which is 1726% higher than the Ohio average and 5089% higher than the national average. The median age in South Euclid is 38 which is approximately 3% lower than the Ohio average of 39. In South Euclid, 49% of the population over 15 years of age are married, 93% speak English and 2% speak Spanish. 75% of South Euclid residents were born in Ohio, 18% were born out of state, 1% were born outside of the United States and 7% were foreign born.