Avondale is a borough in Chester County, in southeastern Pennsylvania, United States. The population was 1,265 at the 2010 census.
Avondale is located on Pennsylvania Route 41 just south of U.S. Route 1. The community is on the East Branch White Clay Creek.
The borough has a total area of 0.5 square miles (1.3 km2), all land.
As of the 2010 census, the borough was 30.7% non-Hispanic White, 8.9% Black or African American, 1.4% Native American, 0.8% Asian, and 2.8% were two or more races. 59.0% of the population were of Hispanic or Latino ancestry.
At the time of the 2000 census, there were 1,108 people, 345 households, and 247 families residing in Avondale. The population density was 2,248.7 per square mile (873.1/km2). There were 361 housing units at an average density of 732.7 per square mile (284.5/km2). The racial makeup of Avondale was 69.77% White, 16.61% African American, 0.90% Native American, 0.27% Asian, 10.38% from other races, and 2.08% from two or more races. Hispanic or Latino of any race accounted for 38.09% of the population.
Out of the 345 households, 36.5% had children under the age of 18 living with them, 49.6% were married couples living together, 12.8% had a female householder with no husband present, and 28.4% were non-families.