What is the setting of Lock and Key by Sarah Dessen?

The story is set in two unnamed towns that are fictional and unnamed but is believable. There are various specific settings including the Perkins Day High School, the home of Cora and Jamie, the home of Nate Cross, and the mall. The high school is described with a fair amount of detail as Ruby is comparing the school to the Jackson High School she'd attended before moving in with Cora and Jamie. Other settings are also described in sufficient detail.