We examined the geographic concentration and persistence of terrorism using the Global Terrorism Database (GTD). The GTD logs all terrorist incidents worldwide using open-source media, and, for 1970– 2013, includes over 125,000 incidents from over 200 countries and territories. We examined regional and country-level data; different terrorism forms, severity levels, and timeframes (entire period, five-year periods, and annual); and multiple definitions of “elevated” terrorism. The findings reveal that terrorism is concentrated geographically and temporally. Most countries experience peace or very low levels of terrorism; only a few experience substantial outbreaks; very few experience prolonged terrorism; and even fewer, prolonged severe terrorism.