- Buda: I, II
- Óbuda: III
- Pest: IV, V, VI, VII, VIII, IX, X
In the 1930s, 4 new districts were organized, numbered from XI to XIV. On 1 January 1950, 7 neighboring towns and 16 villages were annexed to Budapest by creating 9 new districts, so the number of its districts increased to 22. District IV was annexed to District V and the number IV was given to the northernmost newly merged town, Újpest. Former district borders were also partly modified but the old numbering system is still clear on the map. In 1994, Soroksár left District XX, became the newest district and received the number XXIII.
Listed below are the ordinal numbers of the 23 districts of Budapest, their official names (if there is one), and the names of the neighbourhoods within the districts. Each district can be associated with one or more neighbourhoods named after former towns within Budapest.
- Buda is the hilly part on the west bank of the Danube (red cells in the table below), Districts I, II, III, XI, XII, XXII
- Pest is the flat part on the east bank of the Danube (green cells in the table below). Districts IV, V, VI, VII, VIII, IX, X, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX, XXIII
- Csepel is a big island in the south which barely belongs to Budapest. This part of the island is the District XXI and is also referred as Csepel.
- Margaret Island is an island that is directly administered by the Municipality of Budapest (used to be part of District XIII) and is used as a recreational area
- There is a third island called Óbuda Island (Óbudai-sziget) which forms parts of District III and hosts the Sziget Festival since 1993.