According to the 1910 census, the absolute majority in the Bosanska Dubica municipality were Orthodox Christians (82.94%).

1991

According to the 1991 census, the population of the Bosanska Dubica municipality was 31,577, including:

• 21,811 Serbs (See: Serbs of Bosnia and Herzegovina)
• 6,470 Muslims by nationality (today mostly Bosniaks)
• 1,820 Yugoslavs
• 488 Croats (See: Croats of Bosnia and Herzegovina)
• 988 others

In the town itself, Muslims by nationality (Bosniaks) had a slight majority. During the Bosnian war, around 6,000 people, mostly Bosniaks, were forced to leave the town and municipality, while a similar number of Serb refugees from Croatia and/or other Bosnian towns, found shelter and settled in Bosanska Dubica.

Due to the Bosnian War (1992 - 1995) much of the traditional population of Bosanska Dubica has been displaced outside of Bosnia and Herzegovina.

Current population

In 2006, the majority of inhabitants of municipality were ethnic Serbs. The population is believed to consist of 28,000 Serbs, 2,700 Bosniaks, 200 Croats, and 100 others. However, it has to be mentioned that the demographic picture of Bosanska Dubica today differs from the period before 1991.