In the general election, 4,075,090 ballots were cast.
United States President
United States Senate
United States House
All 26 Illinois seats in the United States House of Representatives were up for election in 1948.
Stevenson: 40–50% 50–60% 60–70%
Green: 40-50% 50-60% 60-70%
|Democratic||Adlai E. Stevenson||2,250,074||57.11|
|Republican||Dwight H. Green (incumbent)||1,678,007||42.59|
|Prohibition||Willis Ray Wilson||9,491||0.24|
|Socialist Labor||Louis Fisher||2,673||0.07|
|Republican||Richard Yates Rowe||684,452||100|
|Republican||Richard Yates Rowe||1,815,907||47.45|
|Prohibition||R. B. Campbell||9,949||0.26|
|Socialist Labor||O. Alfred Olson||2,897||0.08|
|Democratic||Ivan A. Elliott||283,831||51.85|
|Democratic||Joseph P. Burke||263,586||48.15|
|Republican||George F. Barrett (incumbent)||694,186||100|
|Democratic||Ivan A. Elliott||2,019,401||52.61|
|Republican||George F. Barrett (incumbent)||1,806,137||47.06|
|Socialist Labor||Edward C. Gross||3,118||0.08|
Secretary of State
|Democratic||Edward J. Barrett (incumbent)||591,821||100|
Former Illinois Treasurer and incumbent congressman William Stratton won the Republican primary, running unopposed.
|Republican||William G. Stratton||713,430||100|
|Democratic||Edward J. Barrett (incumbent)||2,120,832||54.49|
|Republican||William G. Stratton||1,759,083||45.19|
|Prohibition||Maude Swits Stowell||9,636||0.25|
|Socialist Labor||Gregory P. Lyngas||2,896||0.07|
Auditor of Public Accounts
|Democratic||Benjamin O. Cooper||543,319||100|
|Republican||Sinon A. Murray||648,460||100|
|Democratic||Benjamin O. Cooper||2,030,222||53.15|
|Republican||Sinon A. Murray||1,776,396||46.51|
|Prohibition||Irving B. Gilbert||10,156||0.27|
|Socialist Labor||Nick Mays||2,960||0.08|
|Republican||Elmer H. Droste||644,417||100|
|Republican||Elmer H. Droste||1,769,775||46.46|
|Prohibition||Rupert J. Jordan||10,043||0.26|
|Socialist Labor||Rudolph Kosie||3,024||0.08|
Seats of the Illinois Senate were up for election in 1948. Republicans retained control of the chamber.
State House of Representatives
Seats in the Illinois House of Representatives were up for election in 1948. Democrats flipped control of the chamber.
Trustees of University of Illinois
4,078,146 ballots were cast in the election.
All three who were elected had never before held office as Trustees of the University of Illinois. Incumbent Republican Chester R. Davis lost reelection.  Fellow Republican incumbents Martin Gerard Luken Sr. and Frank Hotchkiss McKelvey were not nominated for what would have been a second term.
|Democratic||Robert Z. Hickman||1,952,705½||17.25|
|Democratic||Frances Best Watkins||1,933,764½||16.95|
|Democratic||George Wirt Herrick||1,918,521||16.95|
|Republican||Chester R. Davis (incumbent)||1,860,339||16.43|
|Republican||Dr. W. L. Crawford||1,837,011||16.23|
|Republican||Charles L. Engstrom||1,781,733½||15.74|
|Prohibition||Regina Ethel Ruyle||10,988||0.10|
|Prohibition||Ross E. Price||10,890½||0.10|
|Socialist Labor||Loren M. Johnson||3,332||0.03|
|Socialist Labor||Bernard Campbell||3,222||0.03|
|Socialist Labor||Henry Cortez||3,139||0.03|
Special judicial elections were held to fill vacancies.
Tenth Judicial Circuit (vacancy caused by resignation of Joseph E. Daily)
|Democratic||Baird V. Helfrich||48,062||47.95|
Thirteenth Judicial Circuit (vacancy caused by death of Frank H. Hayes)
This election was held on November 2, 1948.
|Democratic||Robert E. Larkin||37,341||53.76|
|Republican||S J Holderman||32,118||46.24|
Local elections were held.
- "OFFICIAL VOTE of the STATE OF ILLINOIS Cast at the General Election, November 2, 1948 Judicial elections, 1947–1948, • Primary Election General Primary, April 13, 1948" (PDF). Illinois State Board of Elections. Retrieved 11 July 2020.[permanent dead link]
- Illinois Blue Book 1947-1948. Illinois Secretary of State. p. 747. Retrieved 29 March 2020.
- "Stevenson, Adlai E. II". mchistory.org. Retrieved 22 December 2020.
- McKeever, Porter (1989). Adlai Stevenson: His Life and Legacy. New York: William Morrow and Company. p. 126. ISBN 978-0-688-06661-1.
- Whitney, Alan (15 July 2009). "Stevenson of Illinois". The Nation. Retrieved 1 April 2020.
- Illinois Blue Book 1949-1950. Illinois Secretary of State. pp. 745–46, 785. Retrieved 29 March 2020.
- "Trustees, University of Illinois Board of Trustees" (PDF). University of Illinois. Retrieved 1 April 2020.