The town of Hibbert’s Gore in mid-coast region of Maine has a population (or had, as of the last census) of 1. Yes, that’s one, uno, une. Of course, Maine has plenty of townships (technically unorganized territories) that have no population whatsoever (at least as far as humans go), but they’re mostly up north in the Great North Woods. Hibbert’s Gore is surrounded by normal towns with people, schools, etc. Granted, it is tiny geographically, but still. It is certainly an oddity (though, not the only one in Maine – Unity Township, not to be confused with the Town of Unity which is right next to it in a different county, has a population of only 31 while surrounding towns are much larger).