The number of complaints against Devon and Cornwall Police increased 11% to 1,364 in 2013/14, according to the Independent Police Complaints Commission (IPCC).
The spike comes on the back of a 17% increase in 2012/13.
The definition of "complaint" has now been broadened, which is responsible for some of this year's increase.
There was a total of 2,276 allegations made against Devon and Cornwall Police - 359 allegations per 1,000 employees against a national average of 251 complaints per 1,000 employees.
17 per cent of complaints were upheld by the force.
Of the allegations rejected by the police, of those that went to the IPCC a third were upheld.
On average it took Devon and Cornwall police 108 days to handle a compliant, a week longer than the national average.
Nationally the most common complaints are neglect and rude behaviour by officers,
