As of the 2010 census, Plymouth Township was 83.1% White, 7.0% Black or African American, 0.1% Native American, 7.2% Asian, and 1.7% were two or more races. 2.6% of the population were of Hispanic or Latino ancestry. As of the 2000
census, there were 16,045 people, 6,512 households, and 4,363 families residing in the township. The population density was . There were 6,703 housing units at an average density of . The racial makeup of the township was 89.26%
White, 4.17%
African American, 0.09%
Native American, 5.22%
Asian, 0.01%
Pacific Islander, 0.37% from
other races, and 0.89% from two or more races.
Hispanic or
Latino of any race were 1.25% of the population. There were 6,512 households, out of which 25.1% had children under the age of 18 living with them, 55.0% were
married couples living together, 8.6% had a female householder with no husband present, and 33.0% were non-families. 26.6% of all households were made up of individuals, and 11.2% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 2.97. In the township, the population was spread out, with 20.1% under the age of 18, 7.2% from 18 to 24, 29.6% from 25 to 44, 23.9% from 45 to 64, and 19.2% who were 65 years of age or older. The median age was 41 years. For every 100 females there were 94.7 males. For every 100 females age 18 and over, there were 91.2 males. The median income for a household in the township was $54,069, and the median income for a family was $66,938. Males had a median income of $45,953 versus $35,089 for females. The
per capita income for the township was $28,862. About 2.4% of families and 4.3% of the population were below the
poverty line, including 3.3% of those under age 18 and 4.2% of those age 65 or over. ==Government and politics==