Bulgaria is divided into 31 multi-member constituencies for the purposes of elections to the National Assembly.
In addition to their names, constituencies are numbered from 1 to 31 according to their order in the Cyrillic alphabet.
There are a total of 240 seats in the National Assembly, and each constituency elects between 4 (the guaranteed minimum number of seats in a constituency) and 16 members of parliament.
Below is the numbers of MPs allocated to each constituency by election year.
The number of MPs in 2009 only adds up to 209 because of the electoral system experiment of that year (see further below).