Northwest Harwinton, CT has a population of 3,103 and is the 8,636th largest city in the United States. The population density is 357 per sq mi which is 45% lower than the Connecticut average and 294% higher than the national average. The median age in Northwest Harwinton is 47 which is approximately 17% higher than the Connecticut average of 41. In Northwest Harwinton, 66% of the population over 15 years of age are married, 95% speak English and 0% speak Spanish. 77% of Northwest Harwinton residents were born in Connecticut, 18% were born out of state, 1% were born outside of the United States and 4% were foreign born.