Mason City, Iowa 1923 City Directory - I .. J Surnames
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| Page # | Surnames in order they appear, not necessarily in alphabetical order |
| Page 205 | Icth, Idso, Igou, Ikenberg, Ikenberry |
| Page 206 | Ikenberry, Iler, Illian, Imhoff, Imly, Ingalls, Ingledue, Inman, Ioekem |
| Page 207 | Irons, Irwin, Isaacson, Ivemingson, Iverson, Ives, Ivin, Izaak, Jackley |
| Page 208 | Jackson, Jacobi, Jacobs, Jacobson, Jacoby, Jaeger, James |
| Page 209 | James, Jamesson, Jandresitz, Janes, Jankovich, Jansen, Janssen, Jarosh, Jarvis, Jecman, Jefferson, Jeffri, Jeffries |
| Page 210 | Jeffries, Jekech, Jenison, Jenkins, Jennerjohn, Jennings, Jensen, Jenson, Jenzen, Jeppesen, Jesse |
| Page 211 | Jett, Jewett, Jiral, Joden, Jofoam, Johannsen, Johansen, John, Johnes, Johns, Johnson |
| Page 212 | Johnson |
| Page 213 | Johnson |
| Page 214 | Johnson, Johnston, Johnstone, Jones |
| Page 215 | Jones, Jordan, Jorgenson, Jorgensen |
| Page 216 | Josh, Jotis, Joyce, Juhl, Julian, Julson, Jump, Jurasek, Jutanavich |
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