Including both wartime and postwar deaths, the men of the Old Third died literally all over the United States: (no. in parentheses is the number buried in that state)

2 in Alabama
1 in Arizona (1)
2 in Arkansas (2)
21 in California (18)
3 in Canada (3)
5 in Colorado (5)
4 in unknown Confederate prisons (4)
2 in Connecticut (2)
48 in District of Columbia (34)
5 in Florida (3)
12 in Georgia (11 at Andersonville) (12)
4 in Iowa (4)
14 in Illinois (15)
7 in Indiana (6)
11 in Kansas (12)
1 in Kentucky (1)
1 in Louisiana
3 in Maine (2)
10 in Maryland (8)
1 in Massachusetts (1)
630 in Michigan (760)
4 in Minnesota (3)
2 in Mississippi (1)
4 in Missouri (3)
3 in Montana (3)
4 in Nebraska (5)
0 in New Hampshire (1)
2 in New Jersey (2)
25 in New York (23)
8 in North Carolina (6)
19 in Ohio (16)
8 in Oklahoma (7)
9 in Oregon (9)
34 in Pennsylvania (35)
1 in Rhode Island (1)
7 in South Carolina (8)
2 in South Dakota
5 in Tennessee (5)
4 in Texas (4)
1 in Utah (1)
194 in Virginia (197)
9 in Washington state (9)
15 in Wisconsin (13)
1 in Wyoming (1)