Jim Kenney, Lisa Deeley and John Sabatina Jr. score big victories, while Ed Neilson loses his reelection bid.
The vacant 5th Senatorial District seat will be filled on Tuesday in a special election.
The state House of Representatives last week passed two bills that would shrink the size of the legislature.
The race for City Council at-large seats is competitive for both major parties.
Nine of the 15 Democratic ward leaders in the Northeast on Sunday endorsed Jim Kenney for mayor.
Republicans have nominated Tim Dailey, a history and English teacher at Father Judge High School, as their candidate in the 5th Senatorial District special election.
Republican Martina White defeats Democrat Sarah DelRicci to capture the 170th Legislative District seat.
Democratic mayoral candidates Nelson Diaz and Lynne Abraham last Friday morning addressed members of the Greater Northeast Philadelphia Chamber of Commerce during a breakfast meeting at Wesley Enhanced Living Pennypack Park.
On Saturday, former Gov. and Mayor Ed Rendell appeared in support of Democrat Sarah DelRicci, while Republican Martina White collected three union endorsements.