| State | Area Within Ohio River Basin (Square Miles) | Population |
| _ | _ | 1970 | 1980 | 1990 | 2000 |
| Illinois |
10,745
|
606,062
|
634,259
|
623,454
|
630,523
|
| Indiana |
29,135
|
3,597,990
|
3,830,357
|
3,882,781
|
4,262,799
|
| Kentucky |
39,375
|
3,163,493
|
3,603,516
|
3,269,605
|
3,983,672
|
| New York |
1,955
|
158,355
|
172,303
|
163,747
|
163,878
|
| Ohio |
29,570
|
6,298,122
|
6,558,723
|
6,692,023
|
7,114,446
|
| Pennsylvania |
15,620
|
3,761,083
|
3,693,843
|
3,451,633
|
3,418,325
|
| Virginia |
7,175
|
438,698
|
531,743
|
515,052
|
531,594
|
| West Virginia |
20,610
|
1,616,986
|
1,789,585
|
1,601,541
|
1,593,454
|
| Total |
154,185
|
19,640,789
|
20,814,329
|
20,199,836
|
21,698,691
|
Net Change in Population, 1970 - 2000: +2,057,902 (+10.5%)
Net Change in Population, 1980 - 1990: -614,493 (-3.0%)
Persons per square mile, 2000: 140
Land area data taken from Commission sources. Population data from the 1970, 1980, 1990, and 2000 US Census.
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