Some 200,000 officials were given what was called "light punishment". Some were transferred from their jobs.
A further 80,000 or so were given tougher penalties.
President Xi Jinping has made a campaign against corruption a centrepiece of his governing agenda and many high-profile figures have been caught up in the net.
Barely a week goes by without news of another arrest, BBC China analyst Michael Bristow says.
The number of those caught in 2015 was released during China's annual parliamentary session - no doubt to remind delegates gathered in Beijing, that China's ruling communist party will continue pursuing corrupt officials, our correspondent says.
The reporting body - the Central Committee for Discipline Inspection - rarely explains its methodology or what evidence it considers, and no other details were given in its brief statement about the punishments.
(BBC)