Quadripoint
The Four Corners Monument is the only point in the United States where four states meet: Colorado, Utah, New Mexico, and Arizona meet at right angles. The United States first acquired the area now called Four Corners from Mexico after the Mexican–American War in 1848. In 1863 Congress created Arizona Territory from the western part of New Mexico Territory. The boundary was defined as a line running due south from the southwest corner of Colorado Territory, which had been created in 1861. By defining one boundary as starting at the corner of another Congress ensured the eventual creation of four states meeting at a point, regardless of the inevitable errors of boundary surveying. The monument is centered at .
Springfield (The Simpsons)
Five Corners is "the only geographic location in the US where five states meet". A boundary marker indicates the exact spot. While on their road trip to Itchy & Scratchy Land the Simpsons visit Five Corners, where they each "stand in five different states while holding hands". The location is visited again in "The Bob Next Door", where Sideshow Bob plots to kill Bart at the marker where the location's unique property would result in a lack of extraterritorial jurisdiction, explaining it as: "I can stand in one state, fire a gun in a second state, the bullet will travel through the third, hitting you in the fourth, so you fall dead in the fifth. No single act is against any law, but their sum total is the greatest murder..." In reality no such place exists in the US; the location is a spoof of Four Corners.