New Haven Township is a civil township of Gratiot County in the U.S. state of Michigan. The population was 1,016 at the 2000 census.CommunitiesGardenville was the name of a post office in the western part of the township from 1895 until 1902.New Haven Center is an unincorporated community in the township at. A post office operated there from September 1863 until December 1904.Sethton is an unincorporated community in the township at. It was at first a trading point in the township, named for Seth Gardner. A post office operated from June 1882 to October 1885 and again from August 1887 to December 1904.GeographyAccording to the United States Census Bureau, the township has a total area of 35.6 square miles (92.2 km²), of which 35.5 square miles (92.0 km²) is land and 0.1 square mile (0.2 km²) (0.22%) is water.DemographicsAs of the census of 2000, there were 1,016 people, 351 households, and 269 families residing in the township. The population density was 28.6 per square mile (11.0/km²). There were 377 housing units at an average density of 10.6 per square mile (4.1/km²). The racial makeup of the township was 99.21% White, 0.20% Native American, 0.10% from other races, and 0.49% from two or more races. Hispanic or Latino of any race were 1.38% of the population.