| File # | Defendant | Plaintiff | Year |
| 01286 | Zech, Frank et al. | Een, Chas. A. | 1885 |
| 02712 | Zelewski, Josephine | O'Keefe, W. W. et al. | 1887 |
| 0182 | Zeromski, Jacob | Gruna, Andrew | 1896 |
| 0184 | Zeromski, Valentine | Gruna, Andrew | 1896 |
| 02835 | Zimmer, Michael | Perkins, Martin | 1869 |
| 02199 | Zimmer, William et al. | Lingelbach, Wm. | 1869 |
| 0285 | Zimmerly, Samuel F. | Amey, Eastman | 1862 |
| 01115 | Zinda, John et al. | Defreker, Chas. | 1871 |
| 0287 | Zinda, Joseph et al. | Andrae, G. F. | 1888 |
| 04335 | Zylka, Mike et al. | Molski, George | 1904 |