Maple Valley Township is a civil township of Montcalm County in the U.S. state of Michigan. The population was 2,083 at the 2000 census. As of the census of 2000, there were 2,083 people, 755 households, and 567 families residing in the township. The population density was 58.8 per square mile (22.7/km²). There were 910 housing units at an average density of 25.7 per square mile (9.9/km²). The racial makeup of the township was 97.70% White, 0.19% African American, 0.14% Native American, 0.29% Asian, 0.10% Pacific Islander, 0.29% from other races, and 1.30% from two or more races. Hispanic or Latino of any race were 0.82% of the population.

There were 755 households out of which 34.8% had children under the age of 18 living with them, 61.7% were married couples living together, 7.9% had a female householder with no husband present, and 24.8% were non-families. 20.7% 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 2.75 and the average family size was 3.20.

In the township the population was spread out with 29.0% under the age of 18, 8.5% from 18 to 24, 27.1% from 25 to 44, 22.9% from 45 to 64, and 12.6% who were 65 years of age or older. The median age was 35 years. For every 100 females there were 102.4 males. For every 100 females age 18 and over, there were 104.8 males.

The median income for a household in the township was $36,583, and the median income for a family was $40,433. Males had a median income of $32,738 versus $24,236 for females. The per capita income for the township was $15,163. About 5.1% of families and 7.8% of the population were below the poverty line, including 6.3% of those under age 18 and 9.2% of those age 65 or over.