| IAU/MPC code | Description | Country | MPC-list |
|---|
| 000 | Royal Observatory, Greenwich |  | Greenwich |
| 001 | Isaac Roberts | | Crowborough |
| 002 | Chelmsford borough, (Observatory Raleigh) | | Rayleigh |
| 003 | Observatoire de la Babote |  | Montpellier |
| 004 | Toulouse Observatory | | Toulouse |
| 005 | Observatoire de Paris-Meudon | | Meudon |
| 006 | Observatori Fabra |  | Fabra Observatory, Barcelona |
| 007 | Observatoire de Paris | | Paris |
| 008 | CRAAG: Centre de Recherche en Astronomie, Astrophysique et Geophysique |  | Algiers-Bouzaréah |
| 009 | Sternwarte Uecht, Solar Observatory at Uecht |  | Berne-Uecht |
| 010 | CERGA: Centre de recherches en géodynamique et astrométrie | | Caussols |
| 011 | Sternwarte Wetzikon | | Wetzikon |
| 012 | Observatoire Royal de Belgique/Koninklijke Sterrenwacht van België |  | Uccle |
| 013 | Sterrewacht Leiden |  | Leiden |
| 014 | Marseille Observatory | | Marseilles |
| 015 | Sonnenborgh Observatory | | Utrecht |
| 016 | Besançon Astronomical Observatory | | Besançon |
| 017 | Observatorium Hoher List |  | Hoher List |
| 018 | Sternwarte Bilk | | Düsseldorf-Bilk |
| 019 | Observatoire Cantonal de Neuchâtel | | Neuchâtel |
| 020 | Observatoire de Nice | | Nice |
| 021 | Sternwarte Karlsruhe | | Karlsruhe |
| 022 | Observatory of Turin |  | Pino Torinese |
| 023 | Sternwarte Wiesbaden | | Wiesbaden |
| 024 | Heidelberg-Königstuhl State Observatory | | Heidelberg-Königstuhl |
| 025 | Stuttgart Observatory | | Stuttgart |
| 026 | Observatorium Zimmerwald | | Berne-Zimmerwald |
| 027 | Osservatorio Astronomico di Brera | | Milan |
| 028 | Sternwarte der Universität Würzburg | | Würzburg |
| 029 | Hamburger Sternwarte | | Hamburg-Bergedorf |
| 030 | Osservatorio Astrofisico di Arcetri | | Arcetri Observatory, Florence |
| 031 | Sternwarte Sonneberg | | Sonneberg |
| 032 | Astrophysikalisches Institut und Universitäts-Sternwarte Jena | | Jena |
| 033 | Karl-Schwarzschild-Observatorium | | Karl Schwarzschild Observatory, Tautenburg |
| 034 | Osservatorio Astronomico di Roma Sede di Monte Mario | | Monte Mario Observatory, Rome |
| 035 | Københavns Universitet Astronomisk Observatorium), |  | Copenhagen (Copenhagen University Observatory, |
| 036 | Specola Vaticana |  | Castel Gandolfo |
| 037 | Osservatorio Astronomico di Collurania-Teramo | | Collurania Observatory, Teramo |
| 038 | Osservatorio Astronomico di Trieste | | Trieste |
| 039 | Lunds Universitet Institutionen för astronomi, Lund Observatory |  | Lund |
| 040 | | | Lohrmann Institute, Dresden |
| 041 | Innsbruck Observatory |  | Innsbruck |
| 042 | Einstein Tower | | Potsdam |
| 043 | Osservatorio Astrofisico di Asiago | | Asiago Astrophysical Observatory, Padua |
| 044 | Osservatorio Astronomico di Capodimonte | | Capodimonte Observatory, Naples |
| 045 | Universitäts-Sternwarte Wien | | Vienna (since 1879) |
| 046 | Hvězdárna Kleť |  | Kleť Observatory, České Budějovice |
| 047 | Obserwatorium Astronomiczne Uniwersytet im. Adama Mickiewicza w Poznaniu, Poznań Observatory |  | Poznań |
| 048 | Hvězdárna Hradec Králové | | Hradec Králové |
| 049 | Kvistabergs Observatorium | | Uppsala-Kvistaberg |
| 050 | Stockholms observatorium | | Stockholm (before 1931) |
| 051 | Royal Observatory at the Cape of Good Hope |  | Cape |
| 052 | since 1931), (Stockholms observatorium, Saltsjöbaden Observatory | | Stockholm-Saltsjöbaden |
| 053 | Konkoly Obszervatórium |  | Konkoly Observatory, Budapest (since 1934) |
| 054 | Brorfelde Observatoriet | | Brorfelde |
| 055 | Kraków Observatory | | Kraków (Cracow) |
| 056 | Observatórium Skalnaté pleso |  | Skalnaté Pleso |
| 057 | Belgrade Astronomical Observatory (AOB); Астрономске опсерваторије у Београду |  | Belgrade |
| 058 | Königsberg Observatory, (before 1944) |  | Kaliningrad |
| 059 | Lomnický peak, | | Lomnický štít |
| 060 | Warsaw University Observatory | | Warsaw-Ostrowik |
| 061 | |  | Uzhgorod |
| 062 | Iso-Heikkilä Observatory, University of Turku; Turun observatorio, Turun yliopisto |  | Turku |
| 063 | Tuorla Observatory, University of Turku; Tuorlan observatorio, Turun yliopisto | | Turku-Tuorla |
| 064 | Kevola Observatory, University of Turku; Kevolan tähtitorni, Turun yliopisto | | Turku-Kevola |
| 065 | | | Traunstein |
| 066 | National Observatory of Athens |  | Athens |
| 067 | Lviv University, | | Lvov University Observatory |
| 068 | | | Lvov Polytechnic Institute |
| 069 | |  | Baldone, near Riga |
| 070 | |  | Vilno (before 1883) |
| 071 | Bulgarian National Astronomical Observatory, a.k.a. Rozhen National Astronomical Observatory |  | NAO Rozhen, Smolyan |
| 072 | | | Scheuren Observatory |
| 073 | Bucharest Astronomical Observatory |  | Bucharest |
| 074 | | | Boyden Observatory, Bloemfontein |
| 075 | Tartu Observatory |  | Tartu |
| 076 | Union Observatory Annex, Hartbeespoort | | Johannesburg-Hartbeespoort |
| 077 | (Yale-Columbia Southern Station, 1925–1951)[1] | | Yale-Columbia Station, Johannesburg |
| 078 | Union Observatory | | Johannesburg |
| 079 | | | Radcliffe Observatory, Pretoria |
| 080 | |  | Istanbul |
| 081 | Leiden Southern Station, Hartbeespoort | | Leiden Station, Johannesburg |
| 082 | | | St. Pölten |
| 083 | | | Golosseevo-Kiev |
| 084 | | | Pulkovo Observatory |
| 085 | | | Kiev |
| 086 | | | Odessa |
| 087 | |  | Helwan |
| 088 | | | Kottomia |
| 089 | Nikolaev Astronomical Observatory | | Nikolaev |
| 090 | | | Mainz |
| 091 | | | Observatoire de Nurol, Aurec sur Loire |
| 092 | Piwnice Obserwatorium Astronomiczne; Piwnice Astronomical Observatory | | Torun-Piwnice |
| 093 | |  | Skibotn |
| 094 | Crimean Astrophysical Observatory-Simeis | | Crimea-Simeïs |
| 095 | Crimean Astrophysical Observatory-Nauchnij | | Crimea-Nauchnij |
| 096 | | | Merate |
| 097 | |  | Wise Observatory, Mitzpeh Ramon |
| 098 | Stazione osservativa di Asiago Cima Ekar | | Asiago Observatory, Cima Ekar |
| 099 | Lahti Ursa Observatory; Lahden Ursan tähtitorni | | Lahti |
