Subspecies
- Guatemalan Milksnake, L. t. abnorma (Bocourt, 1886)
- Louisiana Milksnake, L. t. amaura (Cope, 1861)
- Andean Milksnake, L. t. andesiana K.L. Williams, 1978
- Mexican Milksnake, L. t. annulata Kennicott, 1861
- Jalisco Milksnake, L. t. arcifera (Werner, 1903)
- Blanchard's Milksnake, L. t. blanchardi Stuart, 1935
- Pueblan Milksnake, L. t. campbelli Quinn, 1983
- New Mexico Milksnake, L. t. celaenops Stejneger, 1903
- Conant's Milksnake, L. t. conanti K.L. Williams, 1978
- Dixon's Milksnake, L. t. dixoni Quinn, 1983
- Black Milksnake, L. t. gaigeae Dunn, 1937
- Central Plains Milksnake, L. t. gentilis (Baird & Girard, 1853)
- Honduran Milksnake, L. t. hondurensis K.L. Williams, 1978
- Ecuadoran Milksnake, L. t. micropholis (Cope, 1860)
- Pale Milksnake, L. t. multistrata Kennicott, 1861
- Nelson's Milksnake, L. t. nelsoni Blanchard, 1920
- Pacific American Milksnake, L. t. oligozona (Bocourt, 1886)
- Atlantic Central American Milksnake, L. t. polyzona (Cope, 1861)
- Sinaloan Milksnake, L. t. sinaloae K.L. Williams, 1978
- Smith's Milksnake, L. t. smithi K.L. Williams, 1978
- Stuart's Milksnake, L. t. stuarti K.L. Williams, 1978
- Red Milksnake, L. t. syspila (Cope, 1889)
- Utah Milksnake, L. t. taylori W.W. Tanner & Loomis, 1957
- Eastern Milksnake, L. t. triangulum (Lacépède, 1788)
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