Stamford, CT has a population of 127,410 and is the 219th largest city in the United States. The population density is 3,387 per sq mi which is 423% higher than the Connecticut average and 3638% higher than the national average. The median age in Stamford is 36 which is approximately 10% lower than the Connecticut average of 41. In Stamford, 53% of the population over 15 years of age are married, 58% speak English and 23% speak Spanish. 36% of Stamford residents were born in Connecticut, 28% were born out of state, 2% were born outside of the United States and 33% were foreign born.