| Testator or Main Party | Will Type | Case Number |
| Ianck, Mary | Prowill | 5220 |
| Ihms, Ernst | Codewill | 20177 |
| Iles, Thomas J. | Prowill | 2904 |
| Illian, Frederick & Caroline J. | Prowill | 494 |
| Ilsemann, Heinrich M. | Prowill | 8981 |
| Imming, Clemens | Prowill | 3912 |
| Immoor, Henry | Codewill | 18678 |
| Incze, Elizabeth | Prowill | 13106 |
| Incze, Franses | Prowill | 4021 |
| Ingwers, Boi | Prowill | 10375 |
| Innes, Mary L. | Codewill | 12557 |
| Irish, Ahimaaz R. | Prowill | 4063 |
| Irvine, Percy S. | Codewill | 18961 |
| Ivarson, Mary | Codewill | 20785 |
| Ivers, Maria Sophia | Prowill | 6776 |
| Ives, George H. | Prowill | 11143 |
| Iwerson, Iwer | Prowill | 8420 |
| Jack, Andrew | Prowill | 5737 |
| Jacker, Christine | Prowill | 6167 |
| Jacobs, Adolph | Prowill | 12930 |
| Jacobs, Annette Garner | Prowill | 10967 |
| Jacobs, Caroline C. | Prowill | 2110 |
| Jacobs, Catharine M. | Codewill | 14265 |
| Jacobs, Hans | Prowill | 5061 |
| Jacobs, Hans John | Codewill | 19548 |
| Jacobs, Henry H. | Prowill | 8820 |
| Jacobs, Herman T. | Codewill | 14890 |
| Jacobs, Louis | Prowill | 3618 |
| Jacobs, Minnie T. Rolfs | Prowill | 10544 |
| Jacobsen, Charles F. | Codewill | 15746 |
| Jacobsen, Detlef Friederich | Prowill | 7765 |
| Jacobsen, Peter Nicolai | Prowill | 8132 |
| Jager, Chris | Prowill | 8395 |
| Jager, Freda | Prowill | 9531 |
| Jager, Wilhelmine | Codewill | 14825 |
| Jahn, Elise | Prowill | 7472 |
| Jahn, John G. F. | Codewill | 19649 |
| Jahr, Maria Sophia | Prowill | 7080 |
| James, Elizabeth A. | Prowill | 11732 |
| James, Louis S. | Prowill | 14000 |
| James, Thomas | Prowill | 6623 |
| Jansen, August Hinrich | Prowill | 2264 |
| Jansen, Hans Jacob | Prowill | 5552 |
| Jansen, Nicklaus | Prowill | 12757 |
| Jansen, Alfred J. | Prowill | 512 |
| Janns, John | Prowill | 3718 |
| Janssen, Caroline | Prowill | 7220 |
| Janssen, Orey | Prowill | 13844 |
| Jarchow, Dorothea | Prowill | 7671 |
| Jasper, Cornelius | Prowill | 12952 |
| Jefferis, Benjamin R. | Prowill | 520 |
| Jehring, John Sr. | Prowill | 11954 |
| Jehring, Lydia | Prowill | 13889 |
| Jenkins, Catharine | Prowill | 2851 |
| Jenkins, James S. | Prowill | 2669 |
| Jenney, Stephen P. | Prowill | 591 |
| Jennings, Diana P. | Prowill | 7683 |
| Jennings, R. P. | Codewill | 13385 |
| Jennings, Samuel A. | Prowill | 6540 |
| Jennings, Sophia | Codewill | 21328 |
| Jennings, Thomas | Prowill | 7412 |
| Jennings, W. H. | Prowill | 6496 |
| Jensen, Ben (aka Benjamin) | Prowill | 13170 |
| Jensen, Boi | Prowill | 3888 |
| Jensen, Heinrich | Prowill | 4177 |
| Jensen, Jens | Prowill | 3623 |
| Jensen, Jens | Codewill | 9838 |
| Jensen, John C. | Prowill | 13552 |
| Jepsen, Friedericke | Prowill | 12391 |
| Jepsen, George | Prowill | 9562 |
| Jepsen, Hans | Prowill | 12282 |
| Jess, Johann | Prowill | 5542 |
| Jessen, Adolph | Prowill | 8426 |
| Jessen, William | Prowill | 13724 |
| Jessen, William | Codewill | 13724 |
| Jipp, Henry | Prowill | 11834 |
| Jipp, Sophia Wilhelmine | Prowill | 13616 |
| Joeknke, Juergen F. | Prowill | 10319 |
| Joens, Christina | Prowill | 3410 |
| Joens, Hans | Prowill | 8665 |
| Joens, Otto | Prowill | 10008 |
| Joens, Peter | Prowill | 13934 |
| Joens, William | Prowill | 7834 |
| Joers, Heinrich | Prowill | 2795 |
| Joers, Minna | Prowill | 5116 |
| Johannsen, Anna Christine | Prowill | 10878 |
| Johannsen, Christ | Prowill | 12868 |
| Johannsen, Mary | Prowill | 12530 |
| Johannsen, Mary | Codewill | 24031 |
| Johansen, Claus | Prowill | 7517 |
| Johansen, Peter J. | Prowill | 13967 |
| Johanson, Anna (Johnson) | Prowill | 13368 |
| Johanson, S. A. (Johnson) | Prowill | 13918 |
| John, Bertha | Prowill | 3579 |
| Johnson, Albert L. | Codewill | 21476 |
| Johnson, Anna (see Johanson, Anna) | Prowill | 13368 |
| Johnson, Cecil Corwin | Codewill | 16842 |
| Johnson, Christiana | Prowill | 505 |
| Johnson, Christopher R. | Prowill | 10957 |
| Johnson, Daniel M. | Prowill | 1802 |
| Johnson, Dora | Prowill | 7275 |
| Johnson, Elizabeth | Prowill | 10471 |
| Johnson, Frederic C. (see Johnson, Elizabeth No. 10471), | Prowill | 8832 |
| Johnson, George S. | Prowill | 12109 |
| Johnson, Louisa R. | Prowill | 8250 |
| Johnson, Robert I. | Codewill | 22480 |
| Johnson, S. A. (see Johanson, S. A.) | Prowill | 13918 |
| Johnson, Sarah A. | Codewill | 7194 |
| Johnson, Sarah A. | Codewill | 7216 |
| Johnson, William J. | Codewill | 21088 |
| Johnston, Mary A. | Prowill | 6960 |
| Johnston, Mary E. | Prowill | 13992 |
| Jones, Archibald | Prowill | 2993 |
| Jones, Asa Z. | Prowill | 3391 |
| Jones, Carrie Alvina | Prowill | 13671 |
| Jones, Hinrich | Prowill | 7672 |
| Jones, Lillie C. | Prowill | 13247 |
| Jones, Margaret | Prowill | 13211 |
| Jones, Mary | Prowill | 6019 |
| Jones, Patrick | Prowill | 4566 |
| Jones, Samuel W. | Prowill | 10732 |
| Jones, Sarah A. | Codewill | 24510 |
| Jones, Thomas | Prowill | 4102 |
| Jones, Thomas | Prowill | 721 |
| Jones, William L. | Prowill | 503 |
| Jordan, Claus | Prowill | 2835 |
| Jorgensen, Jorgen | Prowill | 7559 |
| Juencke, August Ernst | Prowill | 5106 |
| Juergens, Johann Christian | Prowill | 6037 |
| Juergens, Peter | Prowill | 13317 |
| Juergensen, Fred H. | Prowill | 6473 |
| Jugenheimer, Anna | Prowill | 4565 |
| Jugenheimer, Henry | Prowill | 1196 |
| Juhler, Emilie | Prowill | 13495 |
| Juhrend, Johannes | Codewill | 16486 |
| Junge, Ella Augusta | Codewill | 23950 |
| Junge, John F. | Prowill | 10436 |
| Jurgens, Annetta K. | Codewill | 24160 |
| Jurgens, Henry H. | Codewill | 23913 |
| Jurgens, Jacob | Prowill | 6147 |
| Jurgens, Peter | Prowill | 13433 |
| Jurgensen, Jurgen | Prowill | 13108 |