Granite was founded in 2002 as a privately held Delaware limited liability company. Headquartered in Quincy, Massachusetts, Granite has experienced explosive growth while remaining 100% debt free. During the past several years, Granite is consistently included in Inc. Magazine’s Top 500 Fastest Growing Privately Held Companies. In as little as eight years, Granite has grown into a 1,250,000 line phone company with more than 14,000 customers serving 390,000 locations.