Surname W
| SURNAME | TOWNSHIP | RESEARCHER |
| Wagner | Fremont Township | Tom Wagner |
| Waldwieler | Antioch | Lee Koenig |
| Wallace | pos. Deerfield | Jack Hicks |
| Walton | Laura L. Riley | |
| Ware | Peter Blood | |
| Warren | John Winters | |
| Webb | 1840 | Susan Cooper |
| Weidner website |
John J. Weidner | |
| Weirich | DonnaMae3 | |
| Welch | Wauconda | Susan Edgell |
| Wells | Fremont Township, 1880 | Cindy Dorfler-Hederer or Sharon Dorfler Kemble |
| Weniger | Gerry Yost | |
| Werden | Wauconda | Joe Bagg |
| Whitmore | Grayslake | Dawn |
| Wiese | Marilynn Wienke | |
| Wilder | Patricia Lanway Dowling | |
| Williams | Brenda | |
| Williams | Janice Lynn | |
| Wilmot | Laura Hewitt | |
| Wingard | Libertyville, Highland Park | Monette Sutherland |
| Wisner | Avon, Grayslake, Waukegan; 1849-1930 | Charlotte Grabowski |
| Wisner | Phoebe Cortessis | |
| Wood | Libertyville | Tom Fagan |
| Wooldridge⁄Woolridge | TERRY W STEWART | |
| Wilcox | Shields⁄Vernon⁄Libertyville | Marleen Van Horne |
| Williams | Highland Park | Steve Williams |
| Winters | John Winters | |
| Wynkoop | Libertyville⁄Vernon | Chris Wynkoop |
| Wynne | Sandi Evilsizer Koscak |