Lost Mountain, GA is located between Hwy 120 and US41 about 6 to 8 miles west of Marietta, GA. There is a historical county store called Lost Mountain Store on the corner of Lost Mtn Rd and Hwy 20 which has been converted into a bank, Independent Bank & Trust whose home office is located in Powder Springs, GA. They might be able to give you more information about the historical area of Lost Mountain. Good Luck!!!