I00-I99
- I00: Carbuncle Hill Observatory, Coventry, Rhode Island, USA
- I01: Clay Center Observatory, Brookline, Massachusetts, USA
- I02: Cerro Tololo Observatory, La Serena—2MASS, Coquimbo, Chile (Cerro Tololo Inter-American Observatory)
- I03: European Southern Obs., La Silla—ASTROVIRTEL, Coquimbo, Chile (La Silla Observatory)
- I04: Mamalluca Observatory, Vicuña, Coquimbo, Chile
- I05: Las Campanas Observatory-TIE, Chile
- I06: Werner Schmidt Obs., Dennis-Yarmouth Regional HS"", South Yarmouth, Massachusetts, USA
- I07: Conlin Hill Observatory, Oxford, Massachusetts, USA
- I08: Alianza S4, Cerro Burek, El Leoncito, San Juan, Argentina
- I09: Cerro Armazones, Chile
- I10: Campo Catino Austral Obs., San Pedro de Atacama, Chile (Campo Catino Austral Observatory Survey )
- I11: Gemini South Observatory, Cerro Pachón, Chile
- I12: Phillips Academy Observatory, Andover, Massachusetts, USA
- I13: Burleith Observatory, Washington D.C., USA
- I14: Tigh Speuran Observatory, Framingham, Massachusetts, USA
- I15: Wishing Star Observatory, Barrington, Massachusetts, USA
- I16: IAA-AI Atacama, San Pedro de Atacama, Chile
- I17: Thomas G. Cupillari Observatory, Fleetville, Pennsylvania, USA
- I18: Fan Mountain Observatory, Covesville, Virginia, USA
- I19: Observatorio El Gato Gris, Tanti, Córdoba, Argentina
- I20: Observatorio Salvador, Rio Cuarto, Córdoba, Argentina
- I21: El Condor Observatory, Córdoba, Argentina
- I22: Abbey Ridge Observatory, Stillwater Lake, Pocono Summit, Pennsylvania, USA
- I23: Frosty Cold Observatory, Mash Harbor, Maine, USA
- I24: Lake of the Woods Observatory, Locust Grove, Virginia, USA
- I25: ECCCO Observatory, Bosque Alegre, Córdoba, Argentina
- I26: Observatorio Kappa Crucis, Córdoba, Córdoba, Argentina
- I27: Barred Owl Observatory, Carp, Canada
- I28: Starhoo Observatory, Lakeville, Massachusetts, USA
- I29: Middlesex School Observatory, Concord, Massachusetts, USA
- I30: Observatorio Geminis Austral, Rosario, Santa Fe, Argentina
- I31: Observatorio Astronomico del Colegio Cristo Rey, Rosario, Santa Fe, Argentina
- I32: Observatorio Beta Orionis, Rosario, Santa Fe, Argentina
- I33: SOAR, Cerro Pachón, Chile
- I34: Morgantown, Pennsylvania, USA
- I35: Sidoli, Buenos Aires, Argentina (Observatorio Sidoli)
- I36: Observatorio Los Campitos, Cañuela, Argentina
- I37: Astrodomi Observatory, Santa Rita , Argentina
- I38: Observatorio Los Algarrobos, Salto, Argentina
- I39: Observatorio Cruz del Sur, San Justo, Buenos Aires, Argentina
- I40: La Silla--TRAPPIST, Chile
- I41: Palomar Mountain--PTF, California, USA
- I42: Westport Observatory
- I43: Tarleton State University Obs., Stephenville, Texas, USA
- I44: Northwest Florida State College, Niceville, Florida, USA
- I45: Observatorio W Crucis, San Justo, Buenos Aires, Argentina
- I46: The Cottage Observatory, Altoona, Pennsylvania, USA
- I47: Pierre Auger Observatory, Malargüe, Mendoza, Argentina
- I48: Observatorio El Catalejo, Santa Rosa, La Pampa, Argentina
- I49: Sunflower Observatory, Santa Fe, New Mexico, USA
- I50: P2 Observatory, Mayhill, New Mexico, USA
- I51: Clinton
- I55: Valencia
- I56: Observatorio Astronómico John Beckman, Almería, Spain
- I57: Elche
- I58: Bétera
- I59: Observatorio Antares, Muriedas Camargo, Cantabria, Spain
- I60: Guernanderf
- I61: Ourense
- I62: Observatorio Helios Ontigola
- I63: Cygnus Observatory, New Airesford
- I64: Maidenhead
- I65: Yunquera
- I66: Taurus Australis Observatory, Brasília, Brazil
- I67: Hartley Wintney
- I68: Pousada dos Anoes Observatory, Brazil
- I69: AGM Observatory, Marrakech
- I70: Gedney House Observatory, Kirton, England, U.K.
- I71: Observatorio Los Milanos, Caceres, Spain
- I72: Observatorio Carpe-Noctem, Madrid, Spain
- I73: Salvia Observatory, Saulges, France
- I74: Baxter Garden Observatory, Salisbury, England, U.K.
- I75: Observatorio Castellon, Spain
- I76: Tesla Observatory, Valdemorillo, Spain
- I77: CEAMIG-REA Observatory, Belo Horizonte, Brazil
- I78: Observatorio Principia, Málaga, Spain
- I79: AstroCamp, Nerpio, Spain
- I80: Rose Cottage Observatory, Keighley, England, U.K.
- I81: Tarbatness Observatory, Portmahomack, Scotland, U.K.
- I82: Güímar, Canary Islands, Spain
- I83: Cherryvalley Observatory, Rathmolyon, Ireland
- I84: Cerro del Viento, Badajoz, Spain
- I85: Las Negras, Spain
- I86: Observatorio UCM, Madrid, Spain
- I87: Astroshot Observatory, Monasterevin, Ireland
- I88: Fuensanta de Martos, Spain
- I89: RAS Observatory, Nerpio, Spain
- I90: Blackrock Castle Observatory, Ireland
- I91: Retamar, Spain
- I92: Astreo Observatory, Mairena del Aljarafe, Spain
- I93: St Pardon de Conques, France
- I94: Observatorio Rho Ophiocus, Las Rozas de Madrid, Spain
- I95: Observatorio de la Hita, Spain
- I96: Hyperion Observatory, Urbanizacion Caraquiz, Spain
- I97: Penn Heights Observatory, Rickmansworth, U.K.
- I98: El Berrueco, Spain
- I99: Observatorio Blanquita, Vaciamadrid, Spain
Read more about this topic: List Of Observatory Codes