Tremušnjak is a village in central Croatia, in the Town of Petrinja, Sisak-Moslavina County.

According to the 2011 census,[3] the village of Tremušnjak had 47 inhabitants.

This represents 23.04% of its pre-war population according to the 1991 census.

The 1991 census[4] recorded that 98.53% of the village population were ethnic Serbs (201/204), 0.49% were ethnic Croats (1/204), 0.49% were Yugoslavs (1/204) and 0.49% were of other ethnic origin (1/204).

This Sisak-Moslavina County geography article is a stub.