The average household size was 3.02 and the average family size was 3.31. In the township the population was spread out with 30.2% under the age of 18, 5.3% from 18 to 24, 28.2% from 25 to 44, 28.1% from 45 to 64, and 8.2% who were 65 years of age or older. The median age was 38 years. For every 100 females, there were 95.5 males. For every 100 females age 18 and over, there were 93.5 males. The median income for a household in the township was $97,763, and the median income for a family was $104,926. Males had a median income of $76,791 versus $41,759 for females. The per capita income for the township was $37,489. About 1.8% of families and 2.3% of the population were below the poverty line, including 2.0% of those under age 18 and 4.0% of those age 65 or over. Washington Township is governed under the Township form of New Jersey municipal government, one of 141 of 565 municipalities statewide that use this form, the second-most commonly used form of government in the state. The Township Committee is comprised of five members, who are elected directly by the voters at-large in partisan elections to serve three-year terms of office on a staggered basis, with either one or two seats coming up for election each year as part of the November general election in a three-year cycle. At an annual reorganization meeting, the Township Committee selects one of its members to serve as Mayor and another as Vice Mayor.  , the members of the Washington Township Committee are Mayor Matthew Murrello (R, term on committee ends December 31, 2021; term as mayor ends 2020), Vice Mayor Kenneth W. "Bill" Roehrich (R, term on committee ends in 2021, term as vice mayor ends 2020), Gregg F. Forsbrey (R, 2022), John Tyler Oborn (R, 2022) and Kenneth W. Short (R, 2021). The 2013 property tax rate for Washington Township was $2.328 per $100 of assessed value, with an equalization ratio of 97.57%. Washington Township is located in the 7th Congressional District and is part of New Jersey's 25th state legislative district. As of March 23, 2011, there were a total of 12,709 registered voters in Washington Township, of which 1,999 (15.7%) were registered as Democrats, 5,295 (41.7%) were registered as Republicans and 5,401 (42.5%) were registered as Unaffiliated.