According to Transparency International Pakistan's national corruption perception survey, 2011, land administration and police were the two most corrupt and education and military least corrupt departments.
The military which was included in the survey for the first time was the least corrupt department after education.
The judiciary and courts became the fourth most corrupt from the sixth position recorded last year, Dawn newspaper reported.
The taxation department slipped to the 3rd rank from its previous 8th position, while Customs and Tendering and Contracting departments have shown alarming increase in the corruption trend.
Police had topped all the previous years' surveys but the Land Administration has crossed them and the factor of the 'Land Mafia' was one of the big reasons for this increase.
The annual survey report was released at Karachi Press Club in a press conference by TIP Chairman Sohail Muzaffar, along with TIP Advisory Committee chairman Syed Adil Gilani.
This year's survey has been conducted by Gallup Pakistan. Sohail Muzaffar cited the delay in punitive action by the state organs against the corrupt elements in corruption cases like Pakistan Steel, NICL, Punjab Bank, Rental Power Plants, KESC, PIA, Railway and Wapda as the main reason for the rise in corruption levels.
Sohail said that judiciary was confronted by deliberate defiance in implementing Supreme Court orders and delay in punishing corrupt persons by the judiciary is one of the causes of lower ranking of judiciary.
On the inclusion of military in the survey, the TIP chairman said, "We have not included it in the survey, Gallup itself has added military and they have not put railways in the survey".
He said the military should not be placed before the education in the rank because according to him military is less corrupt than the education.