Kansas City

Kansas City itself is famously in Missouri. According to Wikipedia, nine of the fourteen counties of the Kansas City Metropolitan Area are in Missouri and five are in Kansas.

Kansas City lies at the confluence of the Kansas and Missouri rivers. It was incorporated as a town in 1850 and as a city three years later. At this stage, Missouri was a state but Kansas was not; Kansas was incorporated as a state in 1861.

Just to add to the confusion, there is a city in the Kansas part of the metropolitan area that's also called Kansas City. This is what Wikipedia calls a "streetcar suburb" – "a residential community whose growth and development was strongly shaped by the use of streetcar lines as a primary means of transportation." Kansas City, Kansas is the third–largest city in the metropolitan area, with a population of 156,607 in 2020. (The second largest is called Overland Park and is also in Kansas. Its population was 197,238 in 2020, when Kansas City, Missouri had 508,090 inhabitants.)