Rapids is located on the south edge of both the town and the county so that a small part of the community is in the Town of Clarence in Erie County. The hamlet is at the junction of Tonawanda Creek Road, Rapids Road, and Goodrich Road. The community consists of a fire hall, a few businesses, and many residences, primarily in Niagara County. It is part of the Buffalo–Niagara Falls Metropolitan Statistical Area.
Tonawanda Creek flows through the community.
There were 538 households out of which 35.9% had children under the age of 18 living with them, 51.7% were married couples living together, 11.7% had a female householder with no husband present, and 30.5% were non-families. 24.9% of all households were made up of individuals and 8.0% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.02.
In the community the population was spread out with 27.5% under the age of 18, 6.7% from 18 to 24, 36.4% from 25 to 44, 20.0% from 45 to 64, and 9.4% who were 65 years of age or older. The median age was 34 years. For every 100 females there were 101.5 males. For every 100 females age 18 and over, there were 101.8 males.
The median income for a household in the CDP was $38,813, and the median income for a family was $42,067. Males had a median income of $35,859 versus $24,844 for females. The per capita income for the CDP was $19,485. About 6.5% of families and 7.0% of the population were below the poverty line, including 8.3% of those under age 18 and none of those age 65 or over.