IZN
Iznik, Turkey
PAG
Panagjurishte, Bulgaria
PEG
Pedeli, Greece
ISK
Istanbul-Kandili, Turkey
AAE
Addis Ababa, Ethiopia (closed)
ABG
Alibag, India
ABK
Abisko, Sweden
AIA
Vernadsky, Agentine Islands
ALE
Alert, Canada (closed)
AMS
Martin de Vivies, French Southern Territories (no longer IMO)
API
Apia, Western Samoa
AQU
L'Aquila, Italy (closed)
ARS
Arti, Russia
ASC
Ascension Island
ASP
Alice Springs, Australia
BDV
Budkov, Czech Republic
BEL
Belsk, Poland
BFE
Brorfelde, Denmark
BFO
Black Forest Observatory, Germany
BLC
Baker Lake, Canada
BMT
Beijing Ming Tombs, China
BNG
Bangui, Central African Republic (closed)
BOU
Boulder, USA
BOX
Borok, Russia
BRD
Brandon, Canada
BRW
Barrow, USA
BSL
Stennis Space Center, USA
CBB
Cambridge Bay, Canada
CKI
Cokos (Keeling) Islands, Australia
CLF
Chambon la Foret, France
CMO
College, USA
CNB
Canberra, Australia
CNH
Changchun, China (no longer IMO)
CPL
Choutuppal, India
CSY
Casey, Australia
CTA
Charters Towers, Australia
CYG
Cheongyang, Republic of Korea
CZT
Port Alfred, French Southern Territories (no longer IMO)
DED
Deadhorse, USA
DLR
Del Rio, USA (closed)
DLT
Dalat, Vietnam
DMC
Dome Concordia, Antarctica (no longer IMO)
DOU
Dourbes, Belgium
DRV
Dumont d'Urville, French Southern Territories (no longer IMO)
DUR
Duronia, Italy
EBR
Ebro, Spain
ESK
Eskdalemuir, United Kingdom
EYR
Eyrewell, New Zealand
FCC
Fort Churchill, Canada
FRD
Fredericksburg, USA
FRN
Fresno, USA
FUR
Furstenfeldenbruck, Germany
GAN
Gan Int. Airpt, Addu Atoll, Maldives
GCK
Grocka, Serbia
GDH
Qeqertarsuaq (Godhavn), Greenland
GLN
Glenlea, Canada (closed)
GNA
Gnangara, Australia
GNG
Gingin, Australia
GUA
Guam, USA
GUI
Guimar-Tenerife, Spain
GZH
Guangzhou, China (no longer IMO)
HAD
Hartland, United Kingdom
HBK
Hartebeesthoek, South Africa
HER
Hermanus, South Africa
HLP
Hel Observatory, Poland
HON
Honolulu, USA
HRB
Hurbanovo, Slovakia
HRN
Hornsund, Svalbard
HUA
Huancayo, Peru
HYB
Hyderabad, India
IPM
Isal de Pascua, Chile
IQA
Iqaluit, Canada
IRT
Irkutsk (Patrony), Russia
JAI
Jaipur, India
JCO
Jim Carrigan Observatory, Alaska
KAK
Kakioka, Japan
KDU
Kakadu, Australia
KEP
King Edward Point, South Georgia
KHB
Khabarovsk, Russia
KIR
Kiruna, Sweden
KIV
Kiev Dymer, Ukraine
KMH
Keetsmanshoop, Namibia
KNY
Kanoya, Japan
KOU
Kourou, Guyana, France
LER
Lerwick, United Kingdom
LNP
Lunping, Taiwan (closed)
LON
Lonjsko Polje, Croatia
LOV
Lovo, Sweden (closed)
LRM
Learmonth, Australia
LVV
Lviv, Ukraine
LYC
Lycksele, Sweden
LZH
Lanzhou, China (closed)
MAB
Manhay, Belgium
MAW
Mawson, Antarctica
MBC
Mould Bay, Canada (closed)
MBO
Mbour, Senegal (closed)
MCQ
Macquarie Island, Australia
MEA
Meanook, Canada
MGD
Magadan, Russia
MID
Midway Island, USA (closed)
MLT
Misallat, Egypt (closed)
MMB
Memambetsu, Japan
MZL
Manzhouli, China (no longer IMO)
NAQ
Narsarsuaq, Greenland
NCK
Nagycenk, Hungary
NEW
Newport, USA
NGK
Niemegk, Germany
NUR
Nurmijarvi, Finland
NVS
Novosibirsk, Russia
ORC
Base Orcadas, Laurie Island
OTT
Ottawa, Canada
PAF
Port-aux-Francais, Kerguelen Island
PBQ
Poste-de-la-Baleine, Canada (closed)
PET
Paratunka, Russia
PHU
Phuthuy, Vietnam
PIL
Pilar, Argentina
PPT
Pamatai, Tahiti, France
PST
Port Stanley, Falklands Islands
QSB
Qsaybeh, Lebanon (no longer IMO)
RES
Resolute Bay, Canada
REU
La Reunion Island, France
SBA
Scott Base, Antarctica
SBL
Sable Island, Canada
SFS
San Fernando, Spain
SHE
Saint Helena, Saint Helena
SHU
Shumagin, USA
SIT
Sitka, USA
SJG
San Juan, USA
SOD
Sodankyla, Finland
SPG
Saint Petersburg, Russia
SPT
San Pablo-Toledo, Spain
STJ
St John's, Canada
STT
Sao Teotonio, Portugal
SUA
Surlari, Romania
TAM
Tamanrasset, Algeria
TAN
Antananarivo, Madagascar (closed)
TDC
Tristan da Cunha, Tristan da Cunha
THL
Qaanaaq (Thule), Greenland
THY
Tihany, Hungary
TIK
Tiksi, Russia (closed)
TSU
Tsumeb, South Africa
TTB
Tatuoca, Brazil
TUC
Tucson, USA
UPS
Uppsala, Sweden
VAL
Valentia, Eire
VIC
Victoria, Canada
VNA
Neumayer Station, Antarctica
VOS
Vostok, Antarctica
VSS
Vassouras, Brazil
WIC
Conrad, Austria
WMQ
Urumqi, China (no longer IMO)
WNG
Wingst, Germany
YAK
Yakutsk, Russia
YKC
Yellowknife, Canada