Lemannville is an unincorporated community and census-designated place in Ascension and St. James parishes, Louisiana, United States. It was first listed as a CDP in the 2010 Census. Per the 2020 census, the population was 695.
Lemannville is located on the west bank of the Mississippi River along Louisiana Highway 18, east of Donaldsonville and west of New Orleans.
Lemannville first appeared as a census designated place in the 2010 U.S. census.