Arlington, TN has a population of 11,599 and is the 3,512th largest city in the United States. The population density is 503 per sq mi which is 201% higher than the Tennessee average and 455% higher than the national average. The median age in Arlington is 32 which is approximately 16% lower than the Tennessee average of 39. In Arlington, 70% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 63% of Arlington residents were born in Tennessee, 32% were born out of state, 1% were born outside of the United States and 4% were foreign born.