Leptothorax canadensis valid Canada (Ontario). Nearctic.
Provancher, L. 1887c. Fam. X. - Les Formicides. [concl.]. Pp. 245-249 in: Provancher, L. 1887. 1885-1889. Additions et corrections au Volume II de la Faune entomologique du Canada, traitant des Hyménoptères. Québec: C. Darveau, 477 pp.   127920

Leptothorax canadensis calderoni obsolete combination U.S.A. (California). Nearctic.
Creighton, W. S. 1950a. The ants of North America. Bulletin of the Museum of Comparative Zoology 104:1-585.   123910

Leptothorax canadensis kincaidi synonym of Leptothorax canadensis U.S.A. (Alaska). Nearctic.
Pergande, T. 1900. Papers from the Harriman Alaska expedition. XVII. Entomological results (11): Formicidae. Proceedings of the Washington Academy of Sciences 2:519-521.   127768

Leptothorax canadensis obscurus synonym of Leptothorax canadensis U.S.A. (New Mexico). Nearctic.
Viereck, H. L. 1903. Hymenoptera of Beulah, New Mexico. [part]. Transactions of the American Entomological Society 29:56-87.   129540

Leptothorax canadensis yankee synonym of Leptothorax canadensis U.S.A. (South Dakota, Utah, Colorado). Nearctic.
Emery, C. 1895d. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. (Schluss). Zoologische Jahrbücher. Abteilung für Systematik, Geographie und Biologie der Tiere 8:257-360.   124591