 By 1914, the community had grown to about 6,000 people, complete with an elementary school, a telephone system, two stores, a hotel, restaurant, pool hall, laundry and jail.However, by 1930, the population had declined to 124.No plat was filed for Flat, and the town site rests on mining claims, so the existence of Flat may contravene the law, but the U.S. Post Office acknowledged the community and served its few residents with an office until the year 2000.