| SURNAME | FIRST NAME | CASE | REMARKS |
| Ihlenfeldt | Charles | See Ehlenfeldt | |
| Imler | (no name) | Baenish - Imler yr. 1890; case no. 1684; CF 43 | |
| Imler | F.A. | Baenish Joseph Deft. - Imler F.A. Pltf. Rented land S. of W. yr. 1888; Case no. 1684; Box no. C.F. 43 | |
| Irish | John | Durham, Uzziel (Irish, John vs) A mortgage on govertment (sic) lot once owned by Martin Raube, Mary Ann (&) Joseph Hill yr. 1901; #3781; CF60 | |
| Isaacson | Ole | Dellebeck, Andrew Oleson (State of Wis) vs Hougen, Ole K. et al; Anderson, Kund; Anderson, Martin T. Anderson, Thomas; Christianson, T.E. Gulikson, Nils; Gutman, John; Gutman, Joseph; Hougen, Knud; Isaacson, Ole; Jurgenson, Gulik; Knudson, Carl; Knudson, K.L.; Knudson, K.O.; Larson, John; Larson, Ole; Nelson, Nels; Olson, Benedict; Pefferle, Stephen; Thompson, Christian; Thompson, Ole H. Charged with shooting & killing of Gudman Olson Dellebeck yr. 1879; CX2445; CF18 | |
| Iverson | Iver | Butter, Iver vs Iver Iverson yr. 1860; X1695; CF 13 |