The survey also found Bulgarians viewing lawmakers and the executive branch as being most corrupt.
According to a report by the Sofia-based think-tank Centre for the Study of Democracy (CSD), in 2014 39.4 percent of Bulgaria's population above the age of 18 were pressured to pay bribes in the form of money, favours or presents.
Some 29.3 per cent of respondents in the respected study said they had paid bribes.
In most cases, corruption pressure came from public administration officials, the study showed.
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"The fact that most Bulgarians are against corruption, but are nevertheless involved in corrupt practises, shows a structural problem in governance -- corruption turns into an additional cost for the use of administrative services," the report said.
Seven years after joining the European Union, former communist Bulgaria is still subject to strict monitoring by Brussels over its high corruption rates, and slow and inefficient judiciary.