Neck City is a city in Jasper County, Missouri, United States. The population was 228 at the 2020 census. Neck City had its start as a r…Neck City is a city in Jasper County, Missouri, United States. The population was 228 at the 2020 census. Neck City had its start as a rough mining settlement called Hell's Neck. A post office called Neck was established in 1899, and the name was changed to Neck City in 1957. Neck City has been noted for its unusual place name.