Units officially recognized as being from multiple states:

[Stryker65]

While there were multiple units whose men came from several states (Marmaduke's 18th Arkansas, Tyler's 15th Tennessee, Walker's 40th Tennessee, several of the West Virginia and Ohio regiments, etc.) there were very few that were actually recognized with a multi-state designation. Here are some that I know:

Confederate:
1st Alabama, Tennessee, and Mississippi Infantry: Organized in December, 1861, broken up to 42nd Tennessee and 54th Alabama in October, 1862.
Murphy's Alabama and Florida Cavalry Battalion: Organized in 1862, became part of 15th Confederate Cavalry in October, 1863.
Brewer's Alabama and Mississippi Cavalry Battalion: Organized in 1861, became part of 8th Confederate Cavalry in May, 1862.
Dorsey's Arkansas and Missouri Cavalry Squadron: Organized in November, 1862, became part of Slayback's Missouri Cavalry in February, 1865.
Mead's Alabama and Tennessee Partisans: Organized in September, 1862, broken up to 25th Alabama and 27th Tennessee Cavalry Battalions in March, 1865.
Powers' Mississippi and Louisiana Cavalry: Organized in December, 1863, broken up in October, 1863.
Texas/Arizona Brigade: Organized in May, 1862, disbanded in May, 1865.
Choctaw/Chickasaw Cavalry Brigade: Organized in July, 1861, surrendered June, 1865.
Union:
1st Alabama and Tennessee Vidette Cavalry: Organized in December, 1863, mustered out in June, 1864.


There were many other units that switched between state designations during the war, such as:
Confederate:
Robertson's Florida Battery and Dent's Alabama Battery
South Kansas/Texas Mounted Volunteers and 3rd Texas Cavalry
Levi's Louisiana Battery and Barr's Virginia Battery
6th North Carolina Battalion and Cohoon's Virginia Battalion
Lewisburg (Virginia) Light Artillery and Lewisburg (West Virginia) Light Artillery
Union:
9th Missouri Infantry and 59th Illinois Infantry
13th Missouri Infantry and 22nd Ohio Infantry
14th Missouri Infantry and 66th Illinois Infantry
1st, 2nd, 3rd, and 5th California Infantry and 69th, 71st, 72nd, and 106th Pennsylvania Infantry

I feel like I'm missing some...

 

[Taylin]

While I haven't done much in the manner of researching the 2nd Kentucky Infantry (Union), I know for fact that when the war started at least 7 men from Orange County Indiana made the journey to Pendleton (Cincinnati) Ohio and enlisted in that unit. Also apparently a large portion if not a majority of the men seem to be from Ohio. It seems to me that a this would not be uncommon especially with those early regiments given Kentucky's neutrality.

 

[16thVA]

The 1st & 2nd KY were mostly from Ohio. Ohio provided almost 5 full regiments of men who were credited to West Virginia. Pennsylvania provided nearly 2 regiments worth of men credited to West Virginia. West Virginia was the only Union state that did not give the majority of its soldiers to the Union, about half.

 

[John Hartwell]

The Brief, Uneventful History of the Frontier Cavalry (a.k.a. 26th New York Cavalry) | Regimental Histories

Boston Herald, 30 Dec. 1864 The Frontier Cavalry was a unique organization of twelve companies: five each from Massachusetts (A,B,C,D,E) and New York (G,H,I,K,L).and two from Vermont (F & M). It was raised under authority granted by the president to Gen. Dix, commanding the Department of the...

civilwartalk.com

 

[Stryker65]

The Brief, Uneventful History of the Frontier Cavalry (a.k.a. 26th New York Cavalry) | Regimental Histories

Boston Herald, 30 Dec. 1864 The Frontier Cavalry was a unique organization of twelve companies: five each from Massachusetts (A,B,C,D,E) and New York (G,H,I,K,L).and two from Vermont (F & M). It was raised under authority granted by the president to Gen. Dix, commanding the Department of the...

civilwartalk.com

The Vermont companies of this unit were known as the Frontier Cavalry, under Major Josiah Grout, Jr.

 

[tony_gunter]

While there were multiple units whose men came from several states (Marmaduke's 18th Arkansas, Tyler's 15th Tennessee, Walker's 40th Tennessee, several of the West Virginia and Ohio regiments, etc.) there were very few that were actually recognized with a multi-state designation. Here are some that I know:

Confederate:
1st Alabama, Tennessee, and Mississippi Infantry: Organized in December, 1861, broken up to 42nd Tennessee and 54th Alabama in October, 1862.
Murphy's Alabama and Florida Cavalry Battalion: Organized in 1862, became part of 15th Confederate Cavalry in October, 1863.
Brewer's Alabama and Mississippi Cavalry Battalion: Organized in 1861, became part of 8th Confederate Cavalry in May, 1862.
Dorsey's Arkansas and Missouri Cavalry Squadron: Organized in November, 1862, became part of Slayback's Missouri Cavalry in February, 1865.
Mead's Alabama and Tennessee Partisans: Organized in September, 1862, broken up to 25th Alabama and 27th Tennessee Cavalry Battalions in March, 1865.
Powers' Mississippi and Louisiana Cavalry: Organized in December, 1863, broken up in October, 1863.
Texas/Arizona Brigade: Organized in May, 1862, disbanded in May, 1865.
Choctaw/Chickasaw Cavalry Brigade: Organized in July, 1861, surrendered June, 1865.
Union:
1st Alabama and Tennessee Vidette Cavalry: Organized in December, 1863, mustered out in June, 1864.


There were many other units that switched between state designations during the war, such as:
Confederate:
Robertson's Florida Battery and Dent's Alabama Battery
South Kansas/Texas Mounted Volunteers and 3rd Texas Cavalry
Levi's Louisiana Battery and Barr's Virginia Battery
6th North Carolina Battalion and Cohoon's Virginia Battalion
Lewisburg (Virginia) Light Artillery and Lewisburg (West Virginia) Light Artillery
Union:
9th Missouri Infantry and 59th Illinois Infantry
13th Missouri Infantry and 22nd Ohio Infantry
14th Missouri Infantry and 66th Illinois Infantry
1st, 2nd, 3rd, and 5th California Infantry and 69th, 71st, 72nd, and 106th Pennsylvania Infantry

I feel like I'm missing some...

Dave Powell just mentioned a Florida unit that became a Georgia unit.

Here's the post from Dave:

Atlanta campaign: I figured out something interesting today - in the Official Records, four of the six regiments that make up the Florida Brigade are combined. According to those records, these units are the 1st Florida Cavalry (dismounted) merged with the 3rd Florida Infantry; and the 1st/4th infantry.

Now I have several good accounts of this brigade's fight at Dallas, Georgia, including some from the 1st Florida Infantry.

The problem is, their accounts don't match - don't make sense.

Until you realize the OR is wrong. The 1st Florida Cavalry was combined with the 4th Georgia, and the 1st Infantry was merged with the 3rd Infantry. This is made perfectly clear in the original sources at the time.

Suddenly, the accounts match perfectly.

Just so you know, Jonathan Sheppard's "By the Daring of Her Sons," History of the Florida Brigade in the Army of Tennessee is really excellent. Full of good sources, well-written, and very well-indexed.

Have a good evening.

 

[Pollaco]

I don't know if it was ever "officially recognized" as a multi state unit but the Texas Brigade was not made up of just Texans.The 18th Georgia, Hampton's Legion and the 3rd Arkansas fought along side the Texans in various times.I think that when the 3rd Arkansas was part of the Texas Brigade they were the only Trans Mississippi unit serving in the ANV.

 

[Stryker65]

Atlanta campaign: I figured out something interesting today - in the Official Records, four of the six regiments that make up the Florida Brigade are combined. According to those records, these units are the 1st Florida Cavalry (dismounted) merged with the 3rd Florida Infantry; and the 1st/4th infantry.

Now I have several good accounts of this brigade's fight at Dallas, Georgia, including some from the 1st Florida Infantry.

The problem is, their accounts don't match - don't make sense.

Until you realize the OR is wrong. The 1st Florida Cavalry was combined with the 4th Georgia, and the 1st Infantry was merged with the 3rd Infantry. This is made perfectly clear in the original sources at the time.

Suddenly, the accounts match perfectly.

That's ... wrong, though. The 4th Georgia was part of George Doles' or Phillip Cook's Brigade in the AoNV. The actual consolidations were the 1st Florida Dismounted Cavalry with the 4th Infantry, and the 1st and 3rd Infantries.

 

[tony_gunter]

That's ... wrong, though. The 4th Georgia was part of George Doles' or Phillip Cook's Brigade in the AoNV. The actual consolidations were the 1st Florida Dismounted Cavalry with the 4th Infantry, and the 1st and 3rd Infantries.

I think he's talking about the 4th Georgia Cavalry.

 

[Stryker65]

I think he's talking about the 4th Georgia Cavalry.

4th Georgia Cavalry wasn't there either; it was with Iverson's brigade. The other 4th Georgia Cavalry was in the District of Florida, not the Florida Brigade.

 

[Stryker65]

4th Infantry history:

1st Cavalry history:

 

[Stryker65]

https://civilwartalk.com/threads/florida-at-stones-river.93335/

 

[tony_gunter]

4th Infantry history:
View attachment 496409
1st Cavalry history:
View attachment 496410

Yeah, I think he meant Florida instead of Georgia there.

 

[Klaudly]

"1st Louisiana Zouave Battalion " switched to "Confederate States Zouave Battalion"

 

[huskerblitz]

There were a number of Nebraskans that served in Iowa calvary regiments since Nebraska didn't have a cavalry unit yet.

 

[Stryker65]

Yeah, I think he meant Florida instead of Georgia there.

So it wouldn't be a Florida to Georgia switch, then?

 

[Stryker65]

On the subject of Union consolidated units, there were instances like the 1st New England Cavalry (1st Rhode Island and 1st New Hampshire regiments consolidated), 1st Louisiana Cavalry (2nd Rhode Island and 1st Louisiana consolidated), and 1st District of Columbia Cavalry (formed from part of 1st Maryland Cavalry and part of 1st Maine Cavalry).

 

[Biscoitos]

I haven't taken time to read this thread. I apologize if I repeat others contributions.
Jeff Davis Legion (Cavalry) companies from Mississippi, Georgia and I believe Alabama.
Wirt Adams' Cavalry. Often referred to as a Mississippi regiment. It had at least one Louisiana company.

 

[Scott1967]

California Brigade from Pennsylvania but were originally the 1st to 4th California.