Elmo is a city in Nodaway County, Missouri, United States. The population was 168 at the 2010 census. Elmo, first called Ebbony, was platted i…Elmo is a city in Nodaway County, Missouri, United States. The population was 168 at the 2010 census. Elmo, first called Ebbony, was platted in 1879, when the railroad was extended to that point. The community most likely was named after the novel St. Elmo. A post office called Elmo has been in operation since 1886.
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