"Twin Lakes township was named for its two small lakes in section 36, on the first road laid out from St. Paul, through Chisago and Pine counties, to the head of Lake Superior. A map of Minnesota in 1856, by Silas Chapman, shows this road with a small settlement named Twin Lakes, which was the only locality indicated as having inhabitants in Carlton county." - from Collections of the Minnesota Historical Society, volume XVII.
There were 681 households out of which 37.4% had children under the age of 18 living with them, 71.2% were married couples living together, 6.5% had a female householder with no husband present, and 18.5% were non-families. 14.2% of all households were made up of individuals and 2.9% had someone living alone who was 65 years of age or older. The average household size was 2.75 and the average family size was 3.03.
In the township the population was spread out with 26.4% under the age of 18, 6.0% from 18 to 24, 27.1% from 25 to 44, 29.5% from 45 to 64, and 11.0% who were 65 years of age or older. The median age was 40 years. For every 100 females there were 108.1 males. For every 100 females age 18 and over, there were 105.1 males.
The median income for a household in the township was $48,565, and the median income for a family was $54,118. Males had a median income of $40,526 versus $30,114 for females. The per capita income for the township was $20,265. About 4.9% of families and 6.4% of the population were below the poverty line, including 5.6% of those under age 18 and 4.1% of those age 65 or over.