Counties
Cook County
District: 1
County Engineer: John Yonan
Appointment Date: 1/18/2012
Address: 69 W. Washington, 23rd Floor
Chicago, IL 60602
Telephone: (312) 603-1601
Fax: (312) 603-9945
Email: john.yonan@cookcountyil.gov


County Background:
Established on January 15, 1831, Cook County is named after Daniel P. Cook, a pioneer lawyer, first Attorney General of the State and Representative in Congress from 1819 to 1827.


County Population: 5194675
Land Area (Sq. Miles): 949
Assessed Valuation: 87308182435
State Highway Mileage: 1541
County Highway Mileage: 578
Township Highway Mileage: 364
Municipal Highway Mileage: 8807
County Seat: Chicago
State House District(s): 1-30, 31-36, 38-40, 43, 44,47,52-59, 77, 78, 80 82
State Senate District(s): 1-20, 22, 23, 26-30, 39-42
U.S. Congressional Distict(s): 1-11, 13


Past Engineers
NameStartFinish
George A. Quinlan3/4/19146/4/1917
George A. Quinlan3/22/19201/6/1953
William J. Mortimer1/7/19535/26/1963
Andrew V. Plummer5/27/19637/31/1967
Richard H. Golterman8/11/19671/24/1969
Thomas G. Cots1/27/19692/28/1972
Hugo J. Stark3/1/197210/31/1976
Richard H. Golterman11/1/197610/31/1988
Glenn W. Frederichs11/1/19885/27/1993
Karl Kowalski9/1/19939/5/1997
Walter S. Kos2/18/199812/1/2006
Rupert F. Graham5/15/20078/1/2011