Big Sandy, TN has a population of 626 and is the 18,162nd largest city in the United States. The population density is 897 per sq mi which is 486% higher than the Tennessee average and 890% higher than the national average. The median age in Big Sandy is 34 which is approximately 12% lower than the Tennessee average of 39. In Big Sandy, 50% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 67% of Big Sandy residents were born in Tennessee, 31% were born out of state, 1% were born outside of the United States and 1% were foreign born.