C00-C99
- C00: Velikie Luki, Russia
- C01: Lohrmann-Observatorium, Triebenberg, Germany
- C02: Observatorio Royal Park, Spain
- C03: Clayhole Observatory, Jokela, Finland
- C04: Kramatorsk, Ukraine
- C05: Königsleiten, Austria
- C06: Krasnoyarsk, Russia (Siberian State Aerospace University Observatory)
- C07: Anysllum Observatory, Àger, Spain
- C08: Fiby, Sweden
- C09: Rouet, France
- C10: Maisoncelles, France
- C11: City Observatory, Slaný, Czech Republic
- C12: Berta Observatory, Sabadell, Spain
- C13: Como, Italy
- C14: Sky Vistas Observatory, Eichgraben, Austria
- C15: ISON-Ussuriysk, Russia
- C16: Isarwinkel Observatory, Bad Tölz, Germany
- C17: Observatorio Joan Roget, Àger, Spain
- C18: Frasnes-Lez-Anvaing, Belgium
- C19: ROSA Observatory, Vaucluse, France
- C20: Kislovodsk Mtn. Astronomical Stn., Pulkovo Obs., Russia
- C21: Observatorio Via Lactea, Àger, Spain
- C22: Oberwiesenthal, Germany
- C23: Olmen, Belgium
- C24: Seveso, Italy
- C25: Pulkovo Observatory Station, Campo Imperatore, Italy
- C26: Levendaal Observatory, Leiden, Netherlands
- C27: Pallerols, Spain
- C28: Wellinghofen, Germany
- C29: Observatori Astronómic de Les Planes de Son, Spain
- C30: Petrozavodsk University Obs., Sheltozero Stn., Russia
- C31: Sternwarte Neanderhoehe Hochdahl e.V., Erkrath, Germany
- C32: Ka-Dar Observatory, TAU Station, Nizhny Arkhyz, Russia
- C33: Observatorio CEAM, Caimari, Canary Islands, Spain
- C34: Baja Astronomical Observatory, Hungary
- C35: Terrassa, Spain
- C36: Starry Wanderer Observatory, Baran', Belarus
- C37: Stowupland, England, UK
- C38: Varuna Observatory, Cuorgnè, Italy
- C39: Nijmegen, Netherlands
- C40: Kuban State University Astrophysical Observatory, Russia
- C41: MASTER-II Observatory, Kislovodsk, Russia
- C42: Xingming Observatory, Mt. Nanshan, China
- C43: Hoyerswerda, Germany
- C44: A. Volta Observatory, Lanzo d'Intelvi, Italy
- C45: MPC1 Cassia Observatory, La Giustiniana, Italy
- C46: Horizon Observatory, Petropavlovsk, Kazakhstan
- C47: Nonndorf, Austria
- C48: Sayan Solar Observatory, Irkutsk, Russia
- C49: STEREO-A (space observatory)
- C50: STEREO-B (space observatory)
- C51: WISE (space observatory)
- C60: Argelander Institute for Astronomy Obs., Bonn, Germany
- C61: Chelles, France
- C62: Eurac Observatory, Bolzano, Italy
- C63: Giuseppe Piazzi Observatory, Ponte in Valtellina, Italy
- C64: Puchenstuben, Austria
- C65: Observatori Astronòmic del Montsec, Spain
- C66: Observatorio El Cielo de Consell, Balearic Islands, Spain
- C67: Gnevsdorf, Germany
- C68: Ellinogermaniki Agogi Observatory, Pallini, Greece
- C69: Bayerwald Sternwarte, Neuhütte, Germany
- C70: Uiterstegracht Station, Leiden, Netherlands
- C71: Sant Marti Sesgueioles, Spain
- C72: Palestrina, Italy
- C73: Galați Observatory, Romania
- C74: Observatorio El Teatrillo de Lyra, Àger, Spain
- C75: Whitestar Observatory, Borgobello, Italy
- C76: Observatorio Estels, Àger, Spain
- C77: Bernezzo Observatory, Italy
- C78: Martin S. Kraar Observatory, Rehovot, Israel
- C79: Roser Observatory, Blanes, Spain
- C80: Don Astronomical Observatory, Rostov-on-Don, Russia
- C81: Dolomites Astronomical Observatory, Italy
- C82: Osservatorio Astronomico Nastro Verde, Sorrento, Italy
- C83: Badalozhnyj Observatory, Russia
- C84: Badalona, Spain
- C85: Observatorio Cala d'Hort, Ibiza, Balearic Islands, Spain
- C86: Blanes, Spain
- C87: Rimbach, Germany
- C88: Montarrenti Observatory, Siena, Italy
- C89: Astronomical Station Vidojevica
- C90: Vinyols
- C91: Montevenere Observatory, Monzuno
- C92: Valdicerro Observatory, Loreto
- C93: Bellavista Observatory, L'Aquila
- C94: MASTER-II Observatory, Tunka
- C95: SATINO Remote Observatory, Haute Provence
- C96: OACL Observatory, Mosciano Sant Angelo
- C97: Al-Fulaij Observatory, Oman
- C98: Osservatorio Casellina, Scandicci, Italy
- C99: Observatori Can Roig, Llagostera, Catalonia, Spain
Read more about this topic: List Of Observatory Codes