Haslett, MI has a population of 19,951 and is the 2,180th largest city in the United States. The population density is 1,296 per sq mi which is 1185% higher than the Michigan average and 1331% higher than the national average. The median age in Haslett is 40 which is approximately 1% higher than the Michigan average of 40. In Haslett, 56% of the population over 15 years of age are married, 86% speak English and 2% speak Spanish. 66% of Haslett residents were born in Michigan, 21% were born out of state, 1% were born outside of the United States and 12% were foreign born.