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How Duckworth won Illinois: County-by-county analysis

On her way to a convincing victory, Rep. Tammy Duckworth won only 17 of Illinois' 102 counties, mirroring the urban-rural divide seen across the country on Election Day. While Duckworth's percentage-point winning margins weren't nearly as wide as incumbent Sen. Mark Kirk's, the counties Duckworth won had much larger margins in terms of total votes.

Breaking the vote down by county

Kirk won only three counties by more than 10,000 votes, while Duckworth won five, including a massive 900,000-vote margin in Cook County, 23,350 in Will County and 14,296 in Lake County. Kirk won 14 counties by more than 40 percentage points, but that only netted him 62,245 more votes.

KEY: Percentage lead by county

« More votes
for Democrats
More votes
for Republicans »

As of 8:20 a.m. Wednesday, 99.1% of precincts reporting.

Rockford

Highest margin of victory for Kirk by votes: Tazewell County

+17,154 votes

Chicago

Highest margin of victory for

Duckworth:

Cook County

+900,246 votes,

+44.9 percentage points

Peoria

Bloomington

Highest margin of victory for Kirk by percentage: Iroquois County

+51.4 percentage points

Champaign

Springfield

Quincy

East St. Louis

Carbondale

Rockford

Chicago

Peoria

Bloomington

Champaign

Quincy

Springfield

East St. Louis

Carbondale

Previous two Senate elections

2014

2010

Durbin (D) vs.

Oberweis (R)

Giannoulias (D) vs.

Kirk (R)

D

53.6%

D

46.4%

R

R

42.7%

48%

2014

2010

Dick Durbin (D) vs.

Jim Oberweis (R)

Alexi Giannoulias (D) vs.

Mark Kirk (R)

D

53.6%

D

46.4%

R

R

42.7%

48%

How this election compares to previous

Illinois' other seat has been held by Sen. Dick Durbin since 1996, who won re-election in 2014 by the smallest margin of his history of running. In his three previous general elections for Senate, Durbin won by 15 percentage points or more.

Seat won by Duckworth (winner in bold)

Year Dem. candidate Result GOP candidate
2016 Tammy Duckworth
54.4%
40.2%
Mark Kirk
2010 Alexi Giannoulias
46.4%
48%
Mark Kirk
2004 Barack Obama
70%
27%
Alan Keyes
1998 Carol Moseley-Braun
47.4%
50.3%
Peter Fitzgerald
1992 Carol Moseley-Braun
53.3%
43.1%
Richard S. Williamson
1986 Alan Dixon
65.1%
33.7%
Judy Koehler

Seat held by Durbin

Year Dem. candidate Result GOP candidate
2014 Dick Durbin
53.5%
42.7%
Jim Oberweis
2008 Dick Durbin
67.8%
28.5%
Steve Sauerberg
2002 Dick Durbin
60.3%
38%
Jim Durkin
1996 Dick Durbin
56.1%
40.7%
Al Salvi
1990 Paul Simon
65.1%
34.9%
Lynn Martin

Sources: 2016 election results from the Associated Press. Previous election results from the Illinois State Board of Elections and the Federal Election Commission.

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