1991History
Asbestos waste and radioactive waste and controls were addressed in 1991.
1992Civil Rights
L Pearson, Oak Ridge National Laboratory, Oak Ridge, Tennessee, "Update of Idaho Naval Reactor Facilities Miscellaneous Waste Inventory for the 1992 Integrated Data Base Report,...
2000History
== Demographics ==
As of the census of 2000, there were 22,464 people, 9,509 households, and 6,475 families residing in the borough.
2016Education
Wilson Christian Academy was located in the borough, which merged into Cornerstone Christian Preparatory Academy in 2016.
2026Government
== Government and politics ==
As of 2026, the mayor of West Mifflin is Chris Kelly.