Windsor Locks, CT has a population of 12,537 and is the 3,302nd largest city in the United States. The population density is 1,389 per sq mi which is 114% higher than the Connecticut average and 1433% higher than the national average. The median age in Windsor Locks is 45 which is approximately 10% higher than the Connecticut average of 41. In Windsor Locks, 57% of the population over 15 years of age are married, 90% speak English and 3% speak Spanish. 65% of Windsor Locks residents were born in Connecticut, 27% were born out of state, 1% were born outside of the United States and 7% were foreign born.