2010Final results
2010 election for Pennsylvania House District 166
Pennsylvania House of Representatives · Pennsylvania
Greg Vitali (D) won with 58.3% of the vote, defeating John P. Williamson (R) by 16.6 points.
Greg VitaliDemocrat · winner · incumbent
58.3%14,924
John P. WilliamsonRepublican
41.7%10,678
25,602 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 2010
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET