A00-A99
- A00: Gravesend, U.K.
- A01: Masia Cal Maciarol Modul 2
- A02: Masia Cal Maciarol Modul 8
- A03: Torredembarra
- A04: Saint-Caprais
- A05: Belesta
- A06: Mataró
- A07: Gretz-Armainvilliers
- A08: Malibert
- A09: Quincampoix
- A10: Observatorio Astronómico de Conbera
- A11: Wormhout
- A12: Stazione Astronomica di Sozzago
- A13: Observatoire Naef, Marly, Switzerland (Observatory Naef Ependes)
- A14: Les Engarouines Observatory
- A15: Josef Bresser Sternwarte, Borken
- A16: Tentlingen
- A17: Guidestar Observatory, Weinheim
- A18: Herne
- A19: Köln
- A20: Sögel
- A21: Irmtraut
- A22: Starkenburg Sternwarte-SOHAS
- A23: Weinheim, Germany
- A24: New Millennium Observatory, Mozzate
- A25: Nova Milanese
- A26: Darmstadt
- A27: Eridanus Observatory, Langelsheim
- A28: Kempten
- A29: Santa Maria a Monte
- A30: Crespadoro
- A31: Corcaroli Observatory
- A32: Panker
- A33: Volkssternwarte Kirchheim
- A34: Grosshabersdorf
- A35: Hormersdorf Observatory
- A36: Ganda di Aviatico
- A37: Mueggelheim
- A38: Campocatino Automated Telescope, Collepardo
- A39: Altenburg
- A40: Pieta
- A41: Rezman Observatory, Kamnik
- A42: Gehrden
- A43: Inastars Observatory, Potsdam
- A44: Altschwendt
- A45: Karrenkneul
- A46: Lelekovice
- A47: Matera
- A48: Povegliano Veronese
- A49: Uppsala University-Ångström laboratory
- A50: Andrushivka Astronomical Observatory
- A51: Danzig
- A52: Etyek
- A53: Peschiera del Garda
- A54: Ostrorog
- A55: Osservatorio Astronomico Vallemare di Borbona, Italy
- A56: Parma
- A57: Osservatorio Astron. Margherita Hack, Firenze
- A58: Observatoire de Chalandray-Canotiers
- A59: Karlovy Vary Observatory
- A60: YSTAR-NEOPAT Station, Sutherland
- A61: Tortona
- A62: Aichtal
- A63: Cosmosoz Obs., Tassin la Demi Lune
- A64: Couvaloup de St-Cergue
- A65: Le Couvent de Lentin
- A66: Stazione Osservativa Astronomica, Livorno
- A67: Chiusa di Pesio
- A68: Swedenborg Obs., Bockholmwik
- A69: Osservatorio Palazzo Bindi Sergardi
- A70: Lumijoki
- A71: Stixendorf
- A72: Radebeul Observatory (Sternwarte "Adolph Diesterweg" Radebeul, Germany)
- A73: Penzing Astrometric Obs., Vienna
- A74: Bergen-Enkheim Observatory, Germany
- A75: Fort Pius Observatory, Barcelona
- A76: Andromeda Observatory, Miskolc
- A77: Observatoire Chante-Perdrix, Dauban, Haute-Provence, France
- A78: Stia
- A79: Zvezdno Obshtestvo Observatory, Plana
- A80: Lindenberg Observatory
- A81: Balzaretto Observatory, Rome
- A82: Osservatorio Astronomico di Trieste
- A83: Jakokoski Observatory
- A84: TUBITAK National Observatory
- A85: Odessa Astronomical Observatory, Kryzhanovka, Ukraine
- A86: Albigneux
- A87: Rimbach
- A88: Bolzaneto
- A89: Sterni Observatory, Kempten
- A90: Sant Gervasi Observatory, Barcelona
- A91: Hankasalmi Observatory, Hankasalmi, Finland
- A92: Urseanu Observatory, Bucharest
- A93: Lucca
- A94: Cormons
- A95: Taurus Hill Observatory, Varkaus
- A96: Klosterneuburg
- A97: Stammersdorf
- A98: Taurus-1 Observatory, Baran, Belarus
- A99: Osservatorio del Monte Baldo
Read more about this topic: List Of Observatory Codes