You piqued my interest, so I googled the high school. Seeing that it was founded in 1958 gave me the answer.
Correct. Since their district covers four towns, it's a neutral name.
Not 100% sure it plays a factor, but at one time, there was definitely some dislike between Circle Pines(which was founded as kind of a weird hippie collective) and Lexington, which was generally a little more conservative.