- Hermon, St. Lawrence County, New York, United States1
- Howes Cave, Cobleskill, Schoharie County, New York, United States1
- Hudson River, New York, United States1
- Hula Valley and Dead Sea, Israel1
- Huntington (Norwich), Hampshire County, Massachusetts, United States1
- Idar-Oberstein, Hunsr'ck, Rhineland-Palatinate, Germany1
- Ikaría (Nicaria), Sámos, Greece1
- Ilfeld, Thuringia, Germany1
- India1
- Indian Creek, Newberry County, South Carolina, United States1
- Iquique, Tarapaca, Chile1
- Iredell County, North Carolina, United States1
- Ireland1
- Isle Royale, Lake Superior, Keweenaw County, Michigan, United States1
- Isère, Rhône-Alpes, France1
- Italy1
- James River, Virginia, United States1
- Jihocesky, Bohemia, Czech Republic1
- Joplin, Jasper County, Missouri, United States1
- Juan de la Chico Mine, Guanajuato, Mexico1