66th Regiment, Illinois Infantry

Brief History
The 66th Regiment, Illinois Infantry was organized at Benton Barracks, Missouri through September and October, 1861. The regiment mustered in as the 14th Missouri Infantry on November 23, 1861. It was moved to Louisville, Kentucky on June 3-8 and mustered out on July 7, 1865.

For more information on the history of the 66th Regiment, Illinois Infantry, see the following:

• Wikipedia, (accessed 30 Dec 2010) article on the 66th Illinois Volunteer Infantry Regiment.

•The Civil War Archive. (accessed 30 Dec 2010) Brief history of the 66th Regiment Infantry.

Companies in this Regiment with County of Origin
Men often enlisted in a company recruited in the counties where they lived though not always. After many battles, companies might be combined because so many men were killed or wounded. However if you are unsure which company your ancestor was in, try the company recruited in his county first.

The following counties of origin are taken from the Adjutant General's Report, found on the Illinois Civil War Rosters web site. Roster pages are from the same report found on the Internet Archives web site. The rosters show the men who served in each regiment, their residences, dates of enlistment and mustering out, and other remarks.

Company A - many men from out of state - Roster, vol. 4 pages 398-401.

Company B - many men from out of state - Roster, vol. 4 pages 401-403.

Company C - many men from Bureau and Rock Island counties - Bureau and Rock Island county web sites - Roster, vol. 4 pages 404-406.

Company D - many men from the state of Michigan (Michigan Sharpshooters) - Roster, vol. 4 pages 406-410.

Company E - Edgar County - Edgar County web site - Roster, vol. 4 pages 410-414.

Company F - many men from the state of Missouri and Knox County - Knox County web site - Roster, vol. 4 pages 414-416.

Company G - many men from the state of Ohio (Ohio Sharpshooters) - Roster, vol. 4 pages 416-419.

Company H - many men from the state of Ohio (Ohio Sharpshooters) - Roster, vol. 4 pages 419-422.

Company I - many men from Lawrence and Wabash counties - Lawrence and Wabash county web sites - Roster, vol. 4 pages 422-425.

Company K - many men from the state of Ohio (Ohio Sharpshooters) - Roster, vol. 4 pages 425-427.

Unassigned Recruits - Roster, vol. 4 page 427.

The Civil War Soldiers and Sailors database lists 2,156 men on its roster for this unit. Roster.

Other Sources

 * Beginning United States Civil War Research gives steps for finding information about a Civil War soldier. It covers the major records that should be used. Additional records are described in ‘Illinois in the Civil War’ and ‘United States Civil War, 1861 to 1865’ (see below).


 * National Park Service, The Civil War Soldiers and Sailors System, is searchable by soldier's name and state. It contains basic facts about soldiers on both sides of the Civil War, a list of regiments, descriptions of significant battles, sources of the information, and suggestions for where to find additional information.


 * Illinois in the Civil War describes many Confederate and Union sources, specifically for Illinois, and how to find them.. These include compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.


 * United States Civil War, 1861 to 1865 describes and explains United States and Confederate States records, rather than state records, and how to find them. These include veterans’ censuses, compiled service records, pension records, rosters, cemetery records, Internet databases, published books, etc.


 * Barker, Lorenzo and United States. Army. Illinois Infantry Regiment, 66th (1861-1865). Company D, Birge's western sharpshooters in the Civil War, 1861-1865. (Huntington, West Virginia : Blue Acorn Press, c1994). ).


 * Illinois Civil War Rosters from the Adjutant General's Report, 66th Regiment  (accessed 22 Feb. 2011) includes rosters of all the regiments and information on the different companies in each.


 * Illinois State Archives - Illinois Civil War Muster and Descriptive Rolls Database (accessed 14 June 2011). Search by residence, unit, regiment, company or soldier.


 * Civil War Centennial Commission of Illinois. Illinois Military Units in the Civil War. (Springfield, [Ill.] : Civil War Centennial Commission of Illinois, c1962). . FS Library US/CAN Book 977.3 M2im and FS Library US/CAN Film 6334558. Other libraries with this book. Includes military units by county, infantry, cavalry, and artillery regiments, including independent artillery.


 * United States. War Department. Record and Pension Office. Compiled Records Showing Service of Military Units in Volunteer Union Organizations. (Washington, District of Columbia : The National Archives, c1964). 65th-75th Infantry FS Library US/CAN Film 1488477. Other libraries with this microfilm. View online at Internet Archives.


 * Vance, Joseph W and Illinois. Adjutant General's Office. Report of the Adjutant General of the State of Illinois, 1861-1866 .(Salt Lake City, Utah : Filmed by the Genealogical Society of Utah, 1957, 1980). FS Library US/CAN Film 1670784. Other libraries with this book. View online at Internet Archives. Rosters of officers, enlisted men, and historical memorandum of the regiments.