West Sunbury is a borough in Butler County, Pennsylvania, United States. The population was 192 at the 2010 census.
West Sunbury is located in north-central Butler County at 41°0′22″N 79°53′46″W (41.006153, -79.896107). Pennsylvania Routes 138 and 308 run together through the center of the borough as Main Street. By PA 308 it is 10 miles (16 km) south to Butler, the county seat.
According to the United States Census Bureau, West Sunbury has a total area of 0.11 square miles (0.29 km2), all of it land.
As of the census of 2000, there were 104 people, 42 households, and 25 families residing in the borough. The population density was 1,021.8 people per square mile (401.5/km2). There were 47 housing units at an average density of 461.8 per square mile (181.5/km2). The racial makeup of the borough was 100.00% White. Hispanic or Latino of any race were 1.92% of the population.
There were 42 households, out of which 33.3% had children under the age of 18 living with them, 47.6% were married couples living together, 14.3% had a female householder with no husband present, and 38.1% were non-families.