The Cook County, Illinois, general election was held on November 2, 2010.^[1]

Primaries were held February 2, 2010.^[2]

Elections were held for Assessor, Clerk, Sheriff, Treasurer, President of the Cook County Board of Commissioners, all 17 seats of the Cook County Board of Commissioners, Cook County Board of Review district 1, three seats on the Water Reclamation District Board, and judgeships on the Circuit Court of Cook County.

2010 was a midterm election year in the United States. The primaries and general elections for Cook County races coincided with those for federal (House and Senate) and those for state elections.

In the 2010 Cook County Assessor election, incumbent Assessor James Houlihan, a Democrat, first appointed in 1997 who was thrice reelected, did not seek reelection to what would have been a fourth full term.^[7] Joseph Berrios was elected to succeed him.

In the 2010 Cook County Clerk election, incumbent fifth-term Clerk David Orr, a Democrat, was reelected.

In the 2010 Cook County Sheriff election, incumbent first-term Sheriff Tom Dart, a Democrat, was reelected.

In the 2010 Cook County Treasurer election, incumbent third-term Treasurer Maria Pappas, a Democrat, was reelected.

In the 2010 President of the Cook County Board of Commissioners election, incumbent President Todd Stroger, a Democrat appointed in 2006 and elected outright to a full term later that year, lost reelection, being unseated in the Democratic primary by Toni Preckwinkle, who went on to win the general election.

Her victory in this election would make Preckwinkle the first woman to be popularly elected to the office of president of the Cook County Board of Commissioners, and the second woman overall to hold the position after Bobbie L. Steele.^[18]

Quick Facts All 17 seats on the Cook County Board of Commissioners 9 seats needed for a majority, First party ...

2010 Cook County Board of Commissioners election

← 2006 November 2, 2010 2014 →
All 17 seats on the Cook County Board of Commissioners 9 seats needed for a majority
First party Second party   Party Democratic Republican Seats before 12 5 Seats won 13 4 Seat change 1 1 Popular vote 875,019 356,573 Percentage 67.30% 27.42% Swing 9.15% 4.53%   Third party   Party Green Seats before 0 Seats won 0 Seat change Popular vote 68,644 Percentage 5.28% Swing 4.62%

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The 2010 Cook County Board of Commissioners election saw all seventeen seats of the Cook County Board of Commissioners up for election to four-year terms.

Quick Facts 1 of 3 seats on the Cook County Board of Review 2 seats needed for a majority, First party ...

2010 Cook County Board of Review election

← 2008 November 2, 2010 2012 →
1 of 3 seats on the Cook County Board of Review 2 seats needed for a majority
First party Second party   Party Democratic Republican Seats before 3 0 Seats after 2 1 Seat change 1 1 Seats up 1 0 Races won 0 1

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In the 2010 Cook County Board of Review election, one seat, Democratic-held, out of its three seats was up for election.

The Cook County Board of Review has its three seats rotate the length of terms. In a staggered fashion (in which no two seats have coinciding two-year terms), the seats rotate between two consecutive four-year terms and a two-year term.^[31]

Quick Facts 3 of 9 seats on the Metropolitan Water Reclamation District of Greater Chicago 5 seats needed for a majority, First party ...

2010 Metropolitan Water Reclamation District of Greater Chicago election

← 2008 November 2, 2010 2012 →
3 of 9 seats on the Metropolitan Water Reclamation District of Greater Chicago 5 seats needed for a majority
First party Second party Third party   Party Democratic Republican Green Seats before 9 0 0 Seats after 9 0 0 Seat change Seats up 3 0 0 Races won 3 0 0

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In the 2010 Metropolitan Water Reclamation District of Greater Chicago election, three of the nine seats on the Metropolitan Water Reclamation District of Greater Chicago board were up for election in an at-large race.^[2] Since three six-year seats were up for election, voters could vote for up to three candidates and the top-three finishers would win.

Two of the incumbents for the three seats were seeking reelection, Democrats Barbara McGowan and Mariyana Spyropoulos.^[32] Each won reelection, joined by fellow Democrat Michael A. Alvarez in winning election.

8 judgeships on the Circuit Court of Cook County were up for partisan elections due to vacancies.^[1] Other judgeships had retention elections.

13 subcircuit courts judgeships were also up for partisan elections due to vacancies.^[1] Other judgeships had retention elections.

Coinciding with the primaries, elections were held to elect the Democratic, Republican, and Green committeemen for the suburban townships.^[33]

• 2010 Illinois elections