According to the 1910 census, the absolute majority in the Bijeljina municipality were Orthodox Christians (70.57%).

At the 1991 census, Bijeljina municipality had 96,796 inhabitants, including:

At present, the municipality has about 150, 000 to 200,000 inhabitants (estimate), with most of whom are Serbs.


Sport

Bijeljina has one major football stadium known as Bijeljina Gradski Stadion. That Stadium is home to FK Radnik Bijeljina. The first football was brought to Bijeljina in 1916. The first football club was FK Podrinje which was formed in 1919. Later came the clubs FK Zora in 1920, FK Građanski in 1923, and FK Semberija in 1935. After World War Two, FK Radnik Bijeljina was formed.

Bijeljina has basketball clubs KK Budućnost Bijeljina, KK Radnik Bijeljina and KK Bijeljina Plus.