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Logan County was formed February 15, 1839, from Sangamon County by an act of the Illinois General Assembly. In 1841 Logan gained more land from Tazewell County. In 1847 a small part of DeWitt County became part of Logan County, completing the county boundaries as we know them today.

The county was named by Abraham Lincoln, a member of the General Assembly at the time and the prime mover in forming the county, in honor of his friend Dr. John Logan, a well known Illinois pioneer and fellow member of the Illinois General Assembly. Dr. Logan, father of Civil War General John A. Logan, was a resident of Murphysboro. He was not from Logan County.

Logan County covers approximately 618 square miles of central Illinois. Lincoln is the third and current county seat. Earlier county seats were Postville, later known as Camden, 1839-47, and Mt. Pulaski, 1847-53. The actual Postville courthouse is at the Henry Ford Museum in Michigan but a reproduction exists in Lincoln. The Mt. Pulaski courthouse, where Lincoln practiced law on the Eighth Judicial Circuit, still stands on the square in that town. It is one of only two still existing court houses where Lincoln actually practiced law on the circuit.

Shortly after the records were moved from Mt. Pulaski, the first courthouse in Lincoln burnt [April 15, 1857] destroying all the records that were housed there. Generally, records from the period before Logan became a county in 1839 may be found at the State Archives or at IRAD in Springfield under Sangamon County. The records for 1839-1857 stored in court house were lost. Original federal land purchase records were not in the court house and still exist. Some deeds and other documents were brought in by the public after the fire and recreated. Some records for that period may show up in abstracts or legal files. The Logan County Genealogical & Historical Society has reconstructed some probate records.


Illinois map with Logan County highlighted

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LOGAN COUNTY PRINTED RESOURCES  -  A Must for the Serious Researcher



DeWitt County Macon County Mason County McLean County
Menard County Sangamon County Tazewell County

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Logan County Mailing List instructions

Logan Query Boards at GenForum

Logan Query Boards at Ancestry

Submit bios, obits, wills, deeds, etc. for the Logan County ILGenWeb site.

Logan County Courthouse
Lincoln, IL 62656-0278
Circuit Court Clerk
County Clerk/Recorder

  • Logan County Genealogical & Historical Society    new     217 732-3200
  • Logan County Courthouse 217 732-8687
  • Lincoln College Museum 217 732-3155 x295
  • Mt. Pulaski Township Historical Society 217 792-3719
  • Mt. Pulaski Courthouse 217 732-8930
  • Elkhart Historical Society 217 947-2238
  • Knapp Library/Museum, 101 S. Clinton, Middletown 217 445-2708
  • Atlanta Library & Museum, Race Street, Atlanta 217 648-2112


Atlanta Library and Museum
Race Street
Atlanta, IL 61723
[217] 648-2112
Elkhart Library
121 E. Bohan
Elkhart, IL 62634
[217] 947-2313
Mt. Pulaski Library
320 N. Washington
Mt. Pulaski, IL 62548
[217] 792-5919
Lincoln Library
725 Pekin Street
Lincoln, IL 62656
(217) 732-8878


ILGenWeb References Project Illinois Vital Records Information
Illinois History Information and Links The ILGenWeb Project US Resources: Illinois


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  • National Archives Genealogy Page
  • Linkpendium -- From the Founders of Rootsweb
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    Copyright by Cheryl Rothwell