| Formica barbata Razoumowsky, 1789 |
| Formica bispinosa Olivier, 1792 |
| Formica blanda Smith, 1858 |
| Formica browni Francoeur, 1973 |
| Formica caespitum Linnaeus, 1758 |
| Formica calviceps Cole, 1954 |
| Formica caryae Fitch, 1855 |
| Formica caustica Kollar, 1832 |
| Formica cephalotes Linnaeus, 1758 |
| Formica chelifera Latreille, 1802 |
| Formica cinerea Mayr, 1853 |
| Formica cinerea var. altipetens Wheeler, 1913 |
| Formica coeca Latreille, 1802 |
| Formica conspicua Smith, 1858 |
| Formica coronata Fabricius, 1804 |
| Formica corusca Smith, 1862 |
| Formica cuneata Perty, 1833 |
| Formica curvidentata Latreille, 1802 |
| Formica densiventris Viereck, 1903 |
| Formica discolor Buckley, 1866 |