Birch Lake Township, Minnesota

Geography According to the United States Census Bureau, the township has a total area of 91.6 km² (35.3 mi²). 74.4 km² (28.7 mi²) of it is land and 17.2 km² (6.6 mi²) of it is water. The total area is 18.76% water.

Demographics As of the census of 2000, there are 573 people, 259 households, and 188 families residing in the township. The population density is 7.7/km² (19.9/mi²). There are 647 housing units at an average density of 8.7/km² (22.5/mi²). The racial makeup of the township is 98.43% White, 0.00% African American, 0.00% Native American, 0.00% Asian, 0.00% Pacific Islander, 0.00% from other races, and 1.57% from two or more races. 0.00% of the population are Hispanic or Latino of any race.

There are 259 households out of which 17.0% have children under the age of 18 living with them, 69.9% are married couples living together, 2.3% have a female householder with no husband present, and 27.4% are non-families. 24.7% of all households are made up of individuals and 7.7% have someone living alone who is 65 years of age or older. The average household size is 2.21 and the average family size is 2.61.

In the township the population is spread out with 17.1% under the age of 18, 4.0% from 18 to 24, 15.7% from 25 to 44, 38.7% from 45 to 64, and 24.4% who are 65 years of age or older. The median age is 53 years. For every 100 females there are 105.4 males. For every 100 females age 18 and over, there are 109.3 males.

The median income for a household in the township is $36,042, and the median income for a family is $39,327. Males have a median income of $31,500 versus $26,875 for females. The per capita income for the township is $18,687. 5.4% of the population and 2.8% of families are below the poverty line. Out of the total people living in poverty, 13.1% are under the age of 18 and 1.5% are 65 or older.