Greenwich, OH has a population of 1,453 and is the 12,882nd largest city in the United States. The population density is 958 per sq mi which is 232% higher than the Ohio average and 957% higher than the national average. The median age in Greenwich is 38 which is approximately 4% lower than the Ohio average of 39. In Greenwich, 56% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 85% of Greenwich residents were born in Ohio, 14% were born out of state, 0% were born outside of the United States and 2% were foreign born.