5th Regiment, Indiana Cavalry (90th Regiment, Indiana Volunteers)
Organized at Indianapolis, Indiana, August 22 to October 30, 1862
Expedition from Pulaski to New Market, Alabama, May 5-13. Mustered out June 16, 1865 
Companies in this Regiment with the Counties 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.
- Officer with Staff - see Roster
- Company A - many men from Grant, Howard, Huntington, Madison, and Hamilton Counties - see Roster on page 455
- Company B - many men from Wayne Counties - see Roster on page 457
- Company C - many men from Pike, Owen, Henry, Fayette, and Starke Counties - see Roster on page 479
- Company D - many men from Allen County - see Roster on page 461
- Company E - many men from Washington County - see Roster on page 263
- Company F - many men from Johnson, Morgan, and Madison Counties - see Roster on page 265
- Company G - many men from Hancock County - see Roster on page 467
- Company H - many men from Decatur and Ripley Counties - see Roster on page 469
- Company I - men from Porter, Lake and Fulton Counties - see Roster on page 471
- Company K - men from Cass, Fulton, Jackson, and La Porte Counties - see Roster on page 473
- Company L - many men from Tippecanoe Country - see Roster on page 475
- Company M - many men from Clark, Kosciuko, Grant, Marion, and Steuben Counties - see - Roster on page 477
- Unassigned Recruits - see Roster on page 479
The list of companies with their counties and their rosters are on the 5th Regiment, Indiana Volunteer Cavalry (90th Regiment, Indiana Volunterrs) web site. (accessed 17 Jan 2011)
- Civil War Soldiers and Sailors System (accessed 13 Dec 2010) can be searched by soldier's name or by regiment; includes regimental rosters and additional history of the regiment.
- The Civil War Archive. (accessed 13 Dec 2010) Brief history of the 5th Regiments, Indiana Cavalry (90th Regiment, Indiana Volunteers).
- Wikipedia (accessed 13 Dec 2010) article on 90th Regimental, Indiana Volunteers.
- Union Army Regimental History Index (accessed 14 Dec 2010) Index Of Regimental Histories: Artillery, Cavalry, Infantry, and other units, states Alabama to Indiana
- National Park Service, The Civil War Soldiers and Sailors System (accessed 4 January 2011).