Crimes including violence causing injury, theft and criminal damage are all down, police said.
The number of reported incidents since last October has fallen by a fifth.
Reported crime across Northern Ireland has fallen each consecutive month from October 2009 to January 2010, down from 9,626 to 7,742, a decrease of 1,884 crimes (a fall of 19.6%).
The December 2009 total was the second lowest monthly figure.
Chief Constable Matt Baggott said: "While this reduction is to be welcomed, we are not complacent. It is our aim to ensure that we have the right number of police officers on our streets, in our communities and neighbourhoods to ensure that we continue to make a real difference."
"We still have much to do, our efforts will be focused on listening to communities, identifying local issues of concern and working together to solve them," he added
Robbery is up 28%. Violence with injury is down 20%, theft down 22% and criminal damage down 30%.
Mr Baggott said: "We will protect our communities by working to reduce serious harm, delivering real results - taking drugs off our streets, reducing road deaths, dealing with alcohol-related crime and working with communities to disrupt terrorist activity."
Clearance rates have improved from 23.1% to 25.2% in the financial year to date, police said.
Mr Baggott said there was a significant threat from dissident republicans.
"With great support from our An Garda Siochana and security service colleagues, we remain committed to tackling the dissident terrorist threat," he added.
"Without this threat, we could concentrate our resources on reducing crime levels even further".
"These are testing times, but police remain committed to working with all communities to provide the public with the level of policing and support they deserve."
© UTV News