Jefferson County An area in Jefferson County City: Danville State: Tri-State Area Country: USA Continent: North America Known Roads: Maple Drive Main Street Political Information Mayor: Roger Doofenshmirtz General Information Languages: English Known Citizens: Phineas, Ferb, and others First Appearance: "Rollercoaster" Jefferson County is a geographic area in part of the Tri-State Area. Danville is located in this region. There is a race course and a museum. ("Oil on Candace", "The Fast and the Phineas"). There is also a middle school (Milo Murphy's Law). Background Information Just like Danville, Jefferson County is named after one of the co-creators of the show, Jeff "Swampy" Marsh. This article is a stub. You can help Phineas and Ferb Wiki by expanding it. Retrieved from "https://phineasandferb.fandom.com/wiki/Jefferson_County?oldid=637967" Categories: Article stubs Locations J Community content is available under CC-BY-SA unless otherwise noted.