Battle for Control — Marshal Younger

Kidsboro is a small town in the woods behind Whit's End in Odyssey. It has a church, a store, a police station, a bakery, a newspaper, and a total of zero citizens over the age of 14. It's a town run by kids. Ryan, the mayor, helps enforce the laws, create new jobs, and keep the peace in a town where he seems to have lots of friends (and a few enemies).
In book #1, an election for Kidsboro mayor sets off a Battle for Control. After Ryan's vote leads to a rebel getting booted from Kidsboro, the most popular (and pretty) girl at Odyssey Middle School won't be stopped in her campaign against him.