Chicago is part of Cook County, but they have their own election authority that is run by different individuals.

Executive Director (equivalent to the Clerk in other jurisdictions): Charles Holiday, Jr.
Assistant Executive Director: Sandra Aspera
Commissioner: Jonathan Swain
Commissioner/Secretary: William Kresse
Chair: Marisel Hernandez
General Counsel: Adam Lasker
Website: https://chicagoelections.gov/en/voting.html

For election purposes, it's only the suburban areas of Cook County that are controlled by the Cook County Clerk. See above for information about Chicago elections.

Cook County Clerk: Karen Yarborough

Website: https://www.cookcountyil.gov/service-categories/voting-and-elections

Clerk:

Website:

Clerk:

Website:

Clerk:

Website:

Clerk:

Website: