The North West Community Development Council (CDC) had 4,000 volunteers last year, up from 2,880 in 2012 and 1,250 the year before.
North West District Mayor Teo Ho Pin revealed this at a celebration to recognise their efforts on Sunday night.
The volunteers helped to organise about 400 activities last year, reaching out to more than 180,000 residents. The CDC serves about 720,000 residents.
Fourteen awards were given out on Sunday to recognise individuals for their commitment to volunteerism, at the event at the National University of Singapore's University Cultural Centre. Guests of honour included Environment and Water Resources Minister Vivian Balakrishnan, who is also MP for Holland-Bukit Timah GRC.
Ten of the awards went to volunteer coordinators of the North West Brisk Walking Clubs. The CDC has 139 such clubs, which organise weekly walks for 68,000 members.
Other award winners, such as Mr Albert Lee, were recognised for their service to the less privileged in the community.
Mr Lee, 67, has been helping needy families in Marsiling for 36 years. Among other things, he led a programme, as part of the Yellow Ribbon Project, to visit residents who had family members in jail to ensure that their basic needs were met.