Another 1,386 county-level officials were also investigated, 1.65 times the figure for 2014 and 15 times the number investigated in 2013, the People's Daily reported.
As a result, 41 prefecture-level and 311 county-level officials were sanctioned by the Communist Party of China (CPC)'s organisational departments.
Since the 18th CPC National Congress in late 2012, inspectors have completed eight rounds of checks, covering all major provincial-level governments, large state-owned enterprises and central financial institutions.
Expanding the supervision net, the inspection is extending to the provincial and municipal level to promote good work styles and fight indiscipline, including corruption, state-run Xinhua news agency reported.