Raion

districtdistrictsraionsrayonraionirayonsulusCity Municipalityrajonadministrative district
A raion (also rayon) is a type of administrative unit of several post-Soviet states (such as part of an oblast).wikipedia
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Oblast

provinceregionVoblast
A raion (also rayon) is a type of administrative unit of several post-Soviet states (such as part of an oblast).
The last translation may lead to confusion, because "raion" may be used for other kinds of administrative subdivision, which may be translated as "region", "district", or "county" depending on the context.

Administrative divisions of Azerbaijan

RayonAutonomous republicCity
After the fall of the Soviet Union, some of the republics kept the raion (e.g. Azerbaijan) while others dropped it (e.g. Armenia).

Districts of Belarus

districtDistrictsRaion
Districts of Belarus (raion) are second-level administrative territorial entities of Belarus.

Azerbaijan

Republic of AzerbaijanAzerbaijan RepublicAZE
After the dissolution of the Soviet Union, raions as administrative units continue to be used in Azerbaijan, Belarus, Georgia, Latvia, Moldova, Russia, and Ukraine.
Azerbaijan is divided into 10 economic regions; 66 rayons (rayonlar, singular rayon) and 77 cities (şəhərlər, singular şəhər) of which 12 are under the direct authority of the republic.

List of municipalities in Georgia (country)

MunicipalityDistricts of Georgia (country)municipalities
Most of them were successors to the earlier subdivisions, known as raioni, "districts".

District

districtsUrban Districtpublic utility district
The term is from the French "rayon" (meaning "honeycomb, department"), which is both a type of a subnational entity and a division of a city, and is commonly translated in English as "district".
In Russia, districts are administrative and municipal divisions of the federal subjects, as well as administrative divisions of larger cities ("city districts") which are commonly referenced as raions and okrugs respectively.

Abkhazia

Republic of AbkhaziaAutonomous Republic of AbkhaziaAbkhaz
The Republic of Abkhazia is divided into seven raions named after their primary cities: Gagra, Gudauta, Sukhumi, Ochamchira, Gulripshi, Tkvarcheli and Gali.

Republic of Crimea

Crimeasingle united nation Crimea
The Republic of Crimea continues to use the administrative divisions previously used by the Autonomous Republic of Crimea and is thus subdivided into 25 regions: 14 districts (raions) and 11 city municipalities (gorodskoj sovet or gorsovet), officially known as territories governed by city councils.

Byelorussian Soviet Socialist Republic

Belarusian SSRByelorussian SSRBelorussian SSR
Administratively it was split into ten okrugs: Bobruysk, Borisov, Vitebsk, Kalinin, Minsk, Mogilev, Mozyr, Orsha, Polotsk, and Slutsk; all of which contained a total of 100 raions and 1,229 selsoviets.

Belarus

BLRRepublic of BelarusBelorussia
After the dissolution of the Soviet Union, raions as administrative units continue to be used in Azerbaijan, Belarus, Georgia, Latvia, Moldova, Russia, and Ukraine.
Regions are further subdivided into raions, commonly translated as districts .

Districts of Russia

Districtmunicipal districts
A district (raion) is an administrative and municipal division of a federal subject of Russia.

Estonia

ESTRepublic of EstoniaEstonian
Counties were again re-established on 1 January 1990 in the borders of the Soviet-era districts.

Administrative divisions of the People's Republic of Romania

Administrative reformregions and districtsadministrative and territorial division
Following the Soviet model, a structure of regions and raions (districts) was created, replacing the former system of județe (counties) and their subdivisions.

Raions of Ukraine

RaionDistrictraions
Raions of Ukraine are the second level of administrative division of Ukraine, below the oblast, and are the most common division of regions of Ukraine.

Moldavian Soviet Socialist Republic

Moldavian SSRMoldovan SSRMoldavia
The old Moldavian ASSR was dismantled and the Moldavian SSR was organized on 2 August 1940, from six full counties and small parts of three other Moldavian counties of Bessarabia (about 65 percent of its territory), and the six westernmost rayons of the Moldavian ASSR (about 40 percent of its territory).

Administrative divisions of South Ossetia

districtdistrictsDistricts of South Ossetia
South Ossetia is subdivided into four raions/ districts:

Administrative divisions of Moldova

DistrictAdministrative territorial entityTerritorial unit
*Administrative divisions of Moldova

Transnistria

Pridnestrovian Moldavian RepublicTransnistrianPridnestrovian Moldovan Republic
Transnistria is subdivided into five districts (raions) and one municipality, the City of Tiraspol (which is entirely surrounded by but administratively distinct from Slobozia District), listed below from north to south (Russian names and transliterations are appended in parentheses).

Moldova

Republic of MoldovaMDAMoldavian
After the dissolution of the Soviet Union, raions as administrative units continue to be used in Azerbaijan, Belarus, Georgia, Latvia, Moldova, Russia, and Ukraine.
Moldova is divided into 32 districts (raioane, singular raion), three municipalities and two autonomous regions (Gagauzia and Transnistria).

Kiev

KyivKiev, UkraineKyiv, Ukraine
Major cities of regional significance as well as the two national cities with special status (Kiev and Sevastopol) are also subdivided into raions (constituting a total of 111 nationwide).
In 1833–1834 according to Tsar Nicholas I's decree, Kiev was subdivided into 6 police raions (districts); later being increased to 10.

Ukrainian Soviet Socialist Republic

Ukrainian SSRSoviet UkraineUkraine
Provinces were further subdivided into raions (districts) which numbered 490.

Autonomous Republic of Crimea

CrimeaAR CrimeaAutonomous Republic Crimea
In Ukraine, there are a total of 450 raions which are the administrative divisions of oblasts (provinces) and the Autonomous Republic of Crimea.
The Autonomous Republic of Crimea had 25 administrative areas: 14 raions (districts) and 11 mis'kradas and mistos (city municipalities), officially known as territories governed by city councils.

Volost

valsčiusvolostscounty
It was started in 1923 in the Urals, North Caucasus, and Siberia as a part of the Soviet administrative reform and continued through 1929, by which time the majority of the country's territory was divided into raions instead of the old volosts and uyezds.
Raions may be roughly called a modern equivalent of both volosts and uyezds.