The River Market is a riverfront neighborhood in Kansas City, Missouri that comprises the first and oldest incorporated district in Kansas City. It stretches north of the downtown Interstate 70 loop to the Missouri River, and is bordered by the Buck O'Neil Bridge on the west and the Heart of America Bridge on the east. As of September 2018, the population w…The River Market is a riverfront neighborhood in Kansas City, Missouri that comprises the first and oldest incorporated district in Kansas City. It stretches north of the downtown Interstate 70 loop to the Missouri River, and is bordered by the Buck O'Neil Bridge on the west and the Heart of America Bridge on the east. As of September 2018, the population was 1,345.