La Monte is a city in Pettis County, Missouri, United States. The population was 1,140 at the 2010 census. La Monte was originally called Boome…La Monte is a city in Pettis County, Missouri, United States. The population was 1,140 at the 2010 census. La Monte was originally called Boomer, and under the latter name was platted in 1866. The present name of La Monte, after an acquaintance of an early postmaster, was adopted in 1870 when the railroad was extended through the neighborhood.
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