Isanti Township is a township in Isanti County, Minnesota, United States. The population was 2,364 at the 2000 census.GeographyAccording to the United States Census Bureau, the township has a total area of 31.5sqmi, of which 30.6sqmi of it is land and 0.9sqmi of it (2.70%) is water.DemographicsAs of the census of 2000, there were 2,364 people, 775 households, and 640 families residing in the township. The population density was 77.2 people per square mile (29.8/km²). There were 807 housing units at an average density of 26.4/sq mi (10.2/km²). The racial makeup of the township was 97.72% White, 0.21% African American, 0.76% Native American, 0.38% Asian, 0.04% from other races, and 0.89% from two or more races. Hispanic or Latino of any race were 1.23% of the population.There were 775 households out of which 45.4% had children under the age of 18 living with them, 73.3% were married couples living together, 5.0% had a female householder with no husband present, and 17.3% were non-families. 13.2% of all households were made up of individuals and 3.2% had someone living alone who was 65 years of age or older. The average household size was 3.05 and the average family size was 3.35.