Massac, KY has a population of 4,299 and is the 7,113th largest city in the United States. The population density is 1,066 per sq mi which is 883% higher than the Kentucky average and 1076% higher than the national average. The median age in Massac is 39 which is approximately 2% higher than the Kentucky average of 39. In Massac, 61% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 66% of Massac residents were born in Kentucky, 26% were born out of state, 1% were born outside of the United States and 7% were foreign born.