Ernestville is an unincorporated community in Lafayette County, in the U.S. state of Missouri.
The community was named after Ernest Worm, a local merchant. The nucleus of the town was the St. Matthew's Church, and a store built by Ernest Worm. The suffix ville added to Mr. Worm's given name formed the town name. The community never had a post office.http://www.missouripostalhistory.org/index.htm
Some estimates suggest that about 3,600 people live in the area and nearby.
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