The suburbs are the place where elections are won and lost these days yet voting patterns in the suburbs are dynamic. For example, here is an overview of what has happened in DuPage County, Illinois, in recent decades:

“It is easy to forget this county, DuPage, was once one of the reddest counties in America not long ago,” Conroy said during Tuesday morning’s Illinois delegate breakfast.
She noted that DuPage was where “Republican presidents raised millions of dollars, produced a U.S. speaker of the House” and led both chambers in Springfield. “But 12 years ago, that tide began to turn,” said Conroy, who in 2012 became the first Democrat to win an Illinois House seat in a district entirely in DuPage.
In 2022, Conroy again made history as the first female elected to head the DuPage County Board and the first Democrat to hold that title in several decades. That same year, Democrats solidified a 12-6 majority on the county board. In 2018, Republicans held all but one seat on the county board.
Conroy said Democratic women also now make up an overwhelming majority of state representatives and senators representing DuPage in Springfield.
This is a change echoed in the other collar counties of the Chicago area: a shift from Republican bases to Democratic majorities. This is all part of the emerging complex suburbia.
At the same time, this is not the first time there was a major political shift in DuPage County. Local historical Leone Schmidt detailed political life in early decades in the county in the 1989 book When the Democrats Ruled DuPage. She describes the book this way:
It covers the impassioned and sophisticated political activities, the interplay of parties and personalities, and the heyday and fall of the Democrats as a force in Du Page County.
Democrats kicked off local political life and helped the county become its own entity. But, within a few decades, Republicans came to dominate local offices. Historian Stephen J. Buck says in the 2019 article “Free Soil, Free Labor, Free Men: The origins of the Republican Party in DuPage County, Illinois”:
By 1860, the Democrats were the minority party in the county, and the Republicans successfully imposed the importance of party loyalty, regardless of local issues, on county politics.
The county has experienced at least two major shifts in political leadership and voting patterns. As politicians and parties fight for votes in DuPage County and other suburbs, there could be future shifts. What can look like solid majorities through multiple decades can change – they have before.

