| Formica pacifica Francoeur, 1973 |
| Formica pallescens Schenck, 1852 |
| Formica pallidefulva Latreille, 1802 |
| Formica pallipes Fabricius, 1787 |
| Formica pallitarsis Provancher, 1881 |
| Formica parva Buckley, 1866 |
| Formica perpilosa Wheeler, 1913 |
| Formica pharaonis Linnaeus, 1758 |
| Formica picea Buckley, 1866 |
| Formica picipes Olivier, 1792 |
| Formica podzolica Francoeur, 1973 |
| Formica propatula Francoeur, 1973 |
| Formica pruinosa Wheeler, 1917 |
| Formica pulla Francoeur, 1973 |
| Formica rasilis Wheeler, 1903 |
| Formica rasilis subsp. spicata Creighton, 1950 |
| Formica retecta Francoeur, 1973 |
| Formica rufa Linnaeus, 1761 |
| Formica rufa subsp. subcaviceps Creighton, 1940 |
| Formica rufa subsp. subfasciata Creighton, 1940 |