According to the United States Census Bureau, the township has a total area of 27.2 square miles, of which, 27.2 square miles of it is land and 0.1 square miles of it is water. It is drained by the Delaware River, which separates it from New Jersey. Past and present villages include Carversville Cross Keys Curley Hill, Danboro, Dyerstown, Fountainville, Gardenville, Griers Corner Groveland, Hinkletown, Kendigtown, Keplers Corner, Landisville, Lower Black Eddy, Lumberville, Melchers Corner, Plumsteadville, Point Pleasant, Smiths Corner, Smithtown, and Wismer. Ralph Stover State Park is located in Plumstead Township and Tinicum Township. Natural features include Cabin Run, Curley Hill, Geddes Run, Hickory Run, Irish Run, Moss Giel Rock, Slobbery Run, and Tohickon Creek.
Neighboring municipalities
Solebury Township
Buckingham Township
Doylestown Township
New Britain Township
Hilltown Township
Bedminster Township
Tinicum Township
Kingwood Township, New Jersey
Climate
According to the Köppen climate classification system, Plumstead Township, Pennsylvania has a hot-summer, wet all year, humid continental climate. Dfa climates are characterized by at least one month having an average mean temperature ≤ 32.0 °F, at least four months with an average mean temperature ≥ 50.0 °F, at least one month with an average mean temperature ≥ 71.6 °F, and no significant precipitation difference between seasons. During the summer months, episodes of extreme heat and humidity can occur with heat index values ≥ 100 °F. On average, the wettest month of the year is July which corresponds with the annual peak in thunderstorm activity. During the winter months, episodes of extreme cold and wind can occur with wind chill values < 0 °F. The plant hardiness zone is 6b with an average annual extreme minimum air temperature of -2.7 °F. The average seasonal snowfall total is between 30 and 36 inches, and the average snowiest month is February which corresponds with the annual peak in nor'easter activity.
As of the 2010 census, the township was 94.1% White, 0.7% Black or African American, 0.1% Native American, 1.7% Asian, and 1.4% were two or more races. 4.7% of the population were of Hispanic or Latino ancestry. As of the census of 2000, there were 11,409 people, 3,938 households, and 3,130 families residing in the township. The population density was 420.1 people per square mile. There were 4,103 housing units at an average density of 151.1/sq mi. The racial makeup of the township was 96.36% White, 0.71% African American, 0.28% Native American, 1.01% Asian, 0.01% Pacific Islander, 0.85% from other races, and 0.78% from two or more races. Hispanic or Latino of any race were 1.98% of the population. There were 3,938 households, out of which 45.1% had children under the age of 18 living with them, 69.8% were married couplesliving together, 6.7% had a female householder with no husband present, and 20.5% were non-families. 15.6% of all households were made up of individuals, and 3.7% had someone living alone who was 65 years of age or older. The average household size was 2.89 and the average family size was 3.26. In the township the population was spread out, with 30.9% under the age of 18, 4.9% from 18 to 24, 36.9% from 25 to 44, 20.8% from 45 to 64, and 6.5% who were 65 years of age or older. The median agewas 34 years. For every 100 females, there were 101.0 males. For every 100 females age 18 and over, there were 98.4 males. The median income for a household in the township was $70,332, and the median income for a family was $80,946. Males had a median income of $56,263 versus $33,633 for females. The per capita income for the township was $29,411. About 2.1% of families and 2.5% of the population were below the poverty line, including 1.8% of those under age 18 and 4.0% of those age 65 or over.
