Jefferson County, Illinois Genealogy

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Jefferson County, Illinois
Boundary map of Jefferson County, Illinois
Map of the U.S. highlighting Illinois
Location of Illinois in the U.S.
Founded: March 26, 1819
County Seat Mt. Vernon
Address Jefferson County Courthouse
100 S. 10th Street
Mt. Vernon, IL 62864
Jefferson County Website


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

County Organization

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

Historical Facts


Jefferson County is named for Thomas Jefferson who was the author of the Declaration of Independence and also the third president of the United States.

Parent County

  • 1819--Jefferson County was created 26 March 1819 from Edwards and White Counties.

County seat:  Mount Vernon [1]

Boundary Changes

Record Loss

Places / Localities

To see a list of places in Jefferson County, click on [Show], in the bar above. The preceding list of places includes incorporated cities and towns, unincorporated towns and communities, and place names that may have been used in family histories. Some have well-organized records and even have web sites. Some are simply social communities with no official records, but which may be referenced in small-town newspapers. The list is provided to help researchers identify localities within the county. As records or histories of these localities are identified, a page will be added for each of these place names.


African American

The following have information concerning African American research.


The Illinois Cemeteries page provides general explanations of the following online Jefferson County resources:

Bibliography Online Gravestone Transcriptions Cemetery Gazetteers
FHLC Find A Grave | national search | county list ePodunk
WorldCat USGenWeb Tombstone Transcription Project  
  Illinois Cemeteries  


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, Jefferson County on page 187.]



FamilySearch has made parish records from two Belleville Diocese Catholic churches in Jefferson County available online (free registration is required). The records include first communions, confirmations, marriages, and deaths:


Jefferson County Courthouse
100 South 10th St.
Mt. Vernon, IL
Phone: (618) 244-8020


Cindy Ford compiled an extensive list of Jefferson County Illinois Early Land Sales, which is available online, courtesy: Genealogy Trails.

Jefferson County, Illinois Early Land Sales and Land Grants available through USGENWEB

Local Histories



  • Civil War
    Civil War service men from Jefferson 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 Jefferson County.
- 44th Regiment, Illinois Infantry, Company I.
- 60th Regiment, Illinois Infantry, Companies C, D, G, and I.
- 70th Regiment, Illinois Infantry, Company E.




County Courthouse

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

Family History Library

Illinois Regional Archives Depository (IRAD)

Public Libraries


Vital Records

Gotoarrow.png Illinois Vital Records for more information.

Indexes for birth, death, and marriage, prior to 1 January 1916 are in the custody of the county clerk.



There are several marriage collections at ILGenWeb.


Societies and Libraries

Genealogical Society of Southern Illinois
John A. Logan College Library
700 Logan College Road
Carterville, Illinois 62918
Telephone: 618-985-2828, Ext. 8338
Hours: vary by season, see website
The Society focuses on Alexander, Clay, Clinton, Edwards, Franklin, Gallatin, Hamilton, Hardin, Jackson, Jefferson, Johnson, Lawrence, Marion, Massac, Monroe, Perry, Pope, Pulaski, Randolph, Richland, Saline, St. Clair, Union, Wabash, Washington, Wayne, White, and Williamson counties. The Society's book and microfilm collection is housed at the John A. Logan College Library. The Society publishes a newsletter (click here for recent issues) and a quarterly journal The Saga of Southern Illinois (click here for a topical index that breaks down what has been published county-by-county).

Jefferson County Historical Society
1411 N 27th St.
Mt. Vernon, IL 62864
Phone: (618) 246-0033

Jefferson County Genealogical Society
c/o C.E. Brehm Memorial Library
101 S. 7th Street
Mt. Vernon, IL 62864

Web Sites


  1. The Handybook for Genealogists: United States of America, 10th ed. (Draper, UT: Everton Publishers, 2002), 195. (FHL Collection Ref Book 973 D27e 2002). WorldCat entry.