Gary, IN has a population of 77,858 and is the 452nd largest city in the United States. The population density is 1,566 per sq mi which is 772% higher than the Indiana average and 1628% higher than the national average. The median age in Gary is 38 which is approximately 2% higher than the Indiana average of 37. In Gary, 40% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 63% of Gary residents were born in Indiana, 35% were born out of state, 0% were born outside of the United States and 2% were foreign born.