Production place
- Corinth, Peloponnese, Greece4 objects
- Corning, Steuben County, New York2 objects
- Crow Agency, Big Horn County, Montana1 objects
- Cusco Region, Southern Peru41 objects
- Cyprus1 objects
- Cyrenaica, Libya1 objects
- Cyrene, Cyrenaica, Libya2 objects
- Cyzicus, ancient Mysia, Anatolia48 objects
- Czechoslovakia (historical political entity)7 objects
- Damascus, Syria1 objects
- Deer Creek, Tehama County, California3 objects
- Del Monte, Monterey, Monterey County1 objects
- Denver Mint, Denver, Denver County184 objects
- Detmold, North Rhine-Westphalia, Germany1 objects
- Detroit, Wayne County, Michigan1 objects
- Dia (ancient place), Bythinia1 objects
- Donner Pass, Placer County, California1 objects
- Dresslerville, Douglas County, Nevada4 objects
- Dömitz, Mecklenburg-Vorpommern, Germany3 objects
- Děčín, Ústí nad Labem Region, Czech Republic2 objects