Tonawanda (formally City of Tonawanda, from Tahnawá•teh meaning “confluent stream” in Tuscarora) is a city in Erie County, New York, United States. The population was 15,130 at the 2010 census. It is at the northern edge of Erie County, south across the Erie Canal (Tonawanda Creek) from North Tonawanda, east of Grand Island, and north of Buffalo. It is part of the Buffalo-Niagara Falls metropolitan area.
Tonawanda is at 43°0′40″N 78°52′38″W / 43.01111°N 78.87722°W / 43.01111; -78.87722 (43.01119, -78.877399).
According to the United States Census Bureau, the city has an area of 4.1 square miles (10.6 km²), of which, 3.8 square miles (9.8 km²) of it is land and 0.3 square miles (0.8 km²) of it (7.34%) is water.
At the 2000 census, there were 16,136 people, 6,741 households, and 4,361 families residing in the city. The population density was 4,252.9 people per square mile (1,643.8/km²). There were 7,119 housing units at an average density of 1,876.3 per square mile (725.2/km²). The racial makeup of the city was 98.08% White, 0.42% Black or African American, 0.46% Native American, 0.39% Asian, 0.01% Pacific Islander, 0.17% from other races, and 0.46% from two or more races. Hispanic or Latino of any race were 0.89% of the population.
There were 6,741 households of which 28.9% had children under the age of 18 living with them, 49.9% were married couples living together, 10.8% had a female householder with no husband present, and 35.3% were non-families. 31.2% of all households were made up of individuals and 13.1% had someone living alone who was 65 years of age or older. The average household size was 2.39 and the average family size was 3.01.
23.9% of the population were under the age of 18, 7.6% from 18 to 24, 29.0% from 25 to 44, 22.7% from 45 to 64, and 16.8% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 94.4 males. For every 100 females age 18 and over, there were 90.2 males.
The median household income was $45,721,