Wilder is a city in Canyon County, Idaho, United States. The population was 1,533 at the 2010 census.
Wilder is part of the Boise City–Nampa, Idaho Metropolitan Statistical Area.
Wilder was established in 1919, and was named for Marshall P. Wilder, a magazine editor.
Wilder is located at 43°40′35″N 116°54′36″W (43.676451, -116.910122).
According to the United States Census Bureau, the city has a total area of 0.74 square miles (1.92 km2), of which, 0.73 square miles (1.89 km2) is land and 0.01 square miles (0.03 km2) is water.
At the 2010 census there were 1,533 people, 453 households, and 353 families living in the city. The population density was 2,100.0 inhabitants per square mile (810.8/km2). There were 501 housing units at an average density of 686.3 per square mile (265.0/km2). The racial makup of the city was 44.6% White, 0.2% African American, 1.8% Native American, 0.4% Asian, 51.1% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 75.9%.
Of the 453 households 52.5% had children under the age of 18 living with them, 54.1% were married couples living together, 16.8% had a female householder with no husband present, 7.1% had a male householder with no wife present, and 22.1% were non-families. 18.8% of households were one person and 7.2% were one person aged 65 or older. The average household size was 3.38 and the average family size was 3.89.