Surname F
| SURNAME | TOWNSHIP | RESEARCHER |
| Fagan | Highwood, Highland Park, Deerfield Twps.; 1837 to present | Bridget |
| Farnsworth | RN | |
| Farrell | Libertyville, Highland Park | Monette Sutherland |
| Farrow | Rita Breeding | |
| Fenno | Wauconda -- 1850 | B. J. (Dutcher) Creager |
| Filstead | Ruth Streed Filstead | |
| Finel | Warren | Don Finel |
| Firnbach | Buffalo Grove & Aptakisic | Denise Thompson |
| Fitzgerald | Chris Fitzgerald | |
| Flagler | Shields⁄Vernon⁄Libertyville | Marleen Van Horne |
| Fliegler | Joyce Higgins | |
| Fox | Highland Park; 1910-1920 | Peggy Doyle |
| Frazier | Sophia Preston | |
| Freeman | Wauconda⁄Waukegan | Marita Brewer-Lee |
| Freiman | Deerfield, Northbrook, Schermerville, and Bach Town | Philip R. Freimann |
| Froelich | Ela - 1854 | Diane Strothers |