Starting with only six members in 1945, the Arab League now occupies an area spanning around 14 million km² and counts 22 members, and 4 observer states. The 22 members today include three of the largest African countries (Sudan, Algeria and Libya) and the largest country in the Middle East (Saudi Arabia).

There was a continual increase in membership during the second half of the 20th century, with an additional 15 Arab states being admitted. Syria was suspended following the 2011 uprising, but its seat was later given to Syrian opposition. As of 2015, there are a total of 22 member states. The Arab League member states are as follows:

Algeria
Bahrain
Comoros
Djibouti
Egypt
Iraq
Jordan
Kuwait
Lebanon
Libya
Mauritania
Morocco
Oman
Palestine
Qatar
Saudi Arabia
Somalia
Sudan
Syrian opposition (seat of Syria)
Tunisia
United Arab Emirates
Yemen

and 1 observer state :
Eritrea

Source: WIKIPEDIA