| SURNAME | CENSUS | TOWNSHIP | FAMILY |
| YEAR | NUMBER | ||
| ZAHN, Henry | 1860 | COHO | 772 |
| ZAHN, Henry | 1880 | COHO | 250 |
| ZAWN, Henry | 1870 | COHO | 128 |
| ZEEB, William | 1870 | HAMB | 77 |
| ZEEB, William | 1880 | HAMB | 205 |
| ZEILER, Jacob | 1860 | DEER | 1123 |
| ZEISS, Ferdinand | 1880 | COHO | 133 |
| ZEITZ, Elizabeth | 1880 | HOWV | 42 |
| ZEITZ, Fred | 1870 | HOWT | 331 |
| ZEITZ, Frederic | 1860 | HOWT | 1780 |
| ZEITZ, Frederick | 1880 | HOWV | 42 |
| ZEITZ, Sarah | 1880 | HOWV | 261 |
| ZIMMERMAN, George H. | 1880 | HOWV | 77 |
| ZIMMERMAN, Lillie M. | 1880 | HOWV | 77 |