The number of people signing on the Live Register fell by 6,800 (3.1%) on a monthly basis in August, new figures from the Central Statistics Office show.
This reduced the seasonally adjusted number of people on the Live Register to 209,900 - the lowest number since June 2008.
In unadjusted terms, a total of 225,158 people were signing on the Live Register in August, down 14.8% on the same time last year.
Today's figures follow statistics from the CSO earlier in the week that showed the unemployment rate fell to 5.6% in August from the revised rate of 5.8% in July.
The Live Register is not designed to measure unemployment as it includes part-time workers - those who work up to three days a week - seasonal and casual workers entitled to Jobseeker's Benefit or Jobseeker's Allowance.
The CSO said that on a seasonally adjusted basis the number of men signing on the Live Register fell by 2.1% in August, while the number of women decreased by 4.3%.
Meanwhile, the number of persons under the age of 25 in the Live Register fell 19.1% in August. The CSO noted that annual decreases in youth unemployment have occurred every month since July 2010.