| Official Name: | West Seneca, New York |
| Settlement Type: | Census-designated place |
| Mapsize: | 260px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | New York |
| Subdivision Type2: | County |
| Subdivision Name2: | Erie |
| Subdivision Type3: | Town |
| Subdivision Name3: | West Seneca |
| Area Footnotes: | [1] |
| Area Total Km2: | 55.53 |
| Area Land Km2: | 55.39 |
| Area Water Km2: | 0.14 |
| Area Total Sq Mi: | 21.44 |
| Area Land Sq Mi: | 21.39 |
| Area Water Sq Mi: | 0.06 |
| Population As Of: | 2020 |
| Population Total: | 45500 |
| Population Density Km2: | 821.43 |
| Population Density Sq Mi: | 2127.46 |
| Timezone: | Eastern (EST) |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Elevation M: | 182 |
| Elevation Ft: | 597 |
| Coordinates: | 42.8392°N -78.7608°W |
| Area Code: | 716 |
| Blank Name: | FIPS code |
| Blank Info: | 36-80907[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 0971949[3] |
| Unit Pref: | Imperial |
West Seneca is a hamlet and census-designated place (CDP) in Erie County, New York, United States. The population was 44,711 at the 2010 census. It is part of the Buffalo - Niagara Falls Metropolitan Statistical Area. The CDP corresponds exactly to the area of the town of West Seneca.
According to the United States Census Bureau, the CDP has a total area of 55.5sqkm, of which 55.3sqkm is land and 0.15sqkm, or 0.27%, is water.
At the 2000 census there were 45,943 people, 18,337 households, and 12,744 families living in the CDP. The population density was 2148.6sp=usNaNsp=us. There were 18,993 housing units at an average density of 888.2sp=usNaNsp=us. The racial makeup of the CDP was 98.11% White, 0.46% Black or African American, 0.17% Native American, 0.50% Asian, 0.01% Pacific Islander, 0.19% from other races, and 0.56% from two or more races. Hispanic or Latino of any race were 0.88%.
Of the 18,337 households 28.2% had children under the age of 18 living with them, 56.2% were married couples living together, 10.3% had a female householder with no husband present, and 30.5% were non-families. 26.6% of households were one person and 13.1% were one person aged 65 or older. The average household size was 2.47 and the average family size was 3.02.
The age distribution was 22.3% under the age of 18, 6.9% from 18 to 24, 27.2% from 25 to 44, 25.4% from 45 to 64, and 18.2% 65 or older. The median age was 41 years. For every 100 females, there were 91.0 males. For every 100 females age 18 and over, there were 88.3 males.
The median household income was $46,264 and the median family income was $54,164. Males had a median income of $39,003 versus $26,846 for females. The per capita income for the CDP was $20,529. About 3.0% of families and 4.6% of the population were below the poverty line, including 5.1% of those under age 18 and 4.7% of those age 65 or over.