North Kansas City is a city in Clay County, Missouri, United States and is an independent municipality that is a part of the Kansas City metropolitan area. A large business/industrial base swells the daytime population by thousands more. Originally a northern suburb across the Missouri River from Kansas City, Missouri, it is now almost completely surrounded by Kansas City, which has annexed far to the north of North Kansas City's northern city limits. North Kansas City also adjoins the small municipality of Avondale. According to the United States Census Bureau, the city has a total area of 4.6 square miles (12 square kilometers), of which, 4.4 square miles (11 square kilometers) of it is land and 0.3 square miles (0.78 square kilometers) of it (5.82%) is water.