Union City, IN has a population of 3,470 and is the 8,086th largest city in the United States. The population density is 1,542 per sq mi which is 759% higher than the Indiana average and 1602% higher than the national average. The median age in Union City is 34 which is approximately 10% lower than the Indiana average of 37. In Union City, 44% of the population over 15 years of age are married, 92% speak English and 8% speak Spanish. 67% of Union City residents were born in Indiana, 27% were born out of state, 0% were born outside of the United States and 6% were foreign born.