The racial makeup of the city was 98.21% White, 0.60% African American, 0.48% Native American, 0.36% Asian, and 0.36% from two or more races. Hispanic or Latino of any race were 2.27% of the population. There were 319 households out of which 38.9% had children under the age of 18 living with them, 55.5% were married couples living together, 10.0% had a female householder with no husband present, and 29.8% were non-families. 21.3% of all households were made up of individuals and 9.4% had someone living alone who was 65 years of age or older. The average household size was 2.62 and the average family size was 3.09. In the city, the population was spread out with 29.5% under the age of 18, 7.8% from 18 to 24, 34.5% from 25 to 44, 19.1% from 45 to 64, and 9.1% who were 65 years of age or older. The median age was 32 years. For every 100 females, there were 100.7 males. For every 100 females age 18 and over, there were 98.7 males. The median income for a household in the city was $84,659, and the median income for a family was $97,673. Males had a median income of $65,000 versus $44,938 for females. The per capita income for the city was $38,312. About 2.6% of families and 4.0% of the population were below the poverty line, including 3.7% of those under age 18 and 7.3% of those age 65 or over. The Madison Lake Watershed and Lake Association is a non-profit organization established for the purpose of protecting and preserving the natural resource of Madison Lake for future generations. MLWLA promotes the protection and improvement of the lake and surrounding watershed area through education and advocacy. Its goals include improving the water quality of the lake through an assessment of the lake's needs to determine the best approach to achieving a healthy, thriving lake and watershed ecosystem.