Warren County, Illinois Genealogy

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Warren County, Illinois
Boundary map of Warren County, Illinois
Map of the U.S. highlighting Illinois
Location of Illinois in the U.S.
Founded: January 13, 1825
County Seat Monmouth
Warren County Courthouse.gif
Photo courtesy Illinois Regional Archives Depository, Illinois State Archives
Address Warren County Courthouse
100 West Broadway
Monmouth, IL 61462
(309) 734-8592
Warren County Website

Template:Illinois-stubUnited States Gotoarrow.png Illinois Gotoarrow.png Warren County

Warren County Organization

Warren County's civil records start the following years:

                                     Beginning Dates for Warren County Records
Birth Marriage Death Census Land Probate

County records are most often kept at the County Courthouse or another local repository. For further information about where the records for Warren County are kept, see the Warren County Courthouse page.

Historical Facts

Joseph Warren.gif

Warren County is named for Joseph Warren who had a leading role in the American patriot organizations in the early days of the Revolution. He was a General in the war, but during the battle of Bunker Hill he fought as a private soldier and was killed during this engagement.[1]

Parent County

  • 1825--Warren County was created 13 January 1825 from Pike County.  County seat:  Monmouth [2]

Boundary Changes

See an interactive map of Warren County boundary changes.

Record Loss

Places / Localities

Populated Places

Neighboring Counties

Records and Resources


  • The Historical Encyclopedia of Illinois has a Warren County edition. This includes a state history section along with a county history and biographies of Warren County residents. See the wiki article for links to available copies and indexes.


Illinois cemetery records often identify birth, death, relationship, and military information, as well as religious affiliation.

  • Find A Grave can be searched by the name of a person or family to find where a person is buried.  Usually gives birth and death dates often with a picture of the tombstone.  May give obituaries, names of family members and links to their information in Find A Grave.


Historical populations
Census Pop.
IL Counties 1900-1990

1840 Pensioners

  • A Census of Pensioners for Revolutionary or Military Services: With their Names, Ages, and Places of Residence, as Returned by the Marshalls of the Several Judicial Districts, Under the Act for Taking the Sixth Census. Washington, D.C., 1841. FHL 973 X2pc 1840; FHL 2321; digital version at Google Books. [See Illinois, Warren County on page 188.]

Church Records

Court Records

Ethnic Research

African American

The following have information concerning African American research.



The Past and present of Warren County, Illinois: containing a history of the county, its cities, towns, &c., a biographical directory of its citizens, war record of its volunteers in the late rebellion, portraits of early settlers and prominent men, general and local statistics, map of Warren County, history of Illinois, Constitution of the United States, miscellaneous matters, etc., etc. Chicago: H.F. Kett & Co., 1877. Digital version at Ancestry ($).

  • Historical Encyclopedia of Illinois and History of Warren County. Chicago: Munsell Pub. Co., 1903. Digital version at Ancestry ($).

Land and Property



Civil War

Civil War service men from Warren County served in various regiments. Men often joined a company (within a regiment) that originated in their county. Listed below are companies or regiments that were formed from men of Warren County.

- 17th Regiment, Illinois Infantry, Company F.
- 36th Regiment, Illinois Infantry, Company C.
- 50th Regiment, Illinois Infantry, Companies A, B, C, D, and K.
- 59th Regiment, Illinois Infantry, Company B.
- 61st Regiment, Illinois Infantry, Company I.
- 83rd Regiment, Illinois Infantry, Companies A, B, C, F, and H.
- 102nd Regiment, Illinois Infantry, Companies A and B.


Newspapers and Obituaries

  • NewspaperArchive.com ($) has historical newspapers online including Burlington, Iowa newspapers dating back to the mid 1800's that may have included Warren County residents. This database is free at some libraries.

Probate Records


County Courthouse

County records are most often kept at the County Courthouse or another local repository. For further information about where the records for Warren County are kept, see the Warren County Courthouse page.

Family History Center

Illinois Regional Archives Depository (IRAD)

IRAD is a system of Illinois Regional Archives Depositories managed by the Illinois State Archives, housing the archival records of local Illinois counties, townships, municipalities and school districts. The seven Regional Depositories are housed on state university campuses scattered throughout Illinois. Western Illinois University houses the records for Warren County.

Public Libraries

Social Groups Online



Vital Records

Web Sites


  1. Joseph Warren www.wikipedia.org
  2. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).