The Canberra Raiders have officially reached 20,000 members, with proud sponsor Denman Prospect jumping on board to help the club break through the 20,000 barrier for the first time in club history.

The Raiders officially closed their membership for their season on June 30 (Saturday), with Denman Prospect purchasing the remaining 13 memberships required to reach 20,000 ahead of Saturday night's match against the Broncos.

Canberra Airport Group Managing Director, Stephen Byron, said they were proud to be a partner of the Raiders through the Denman Prospect sponsorship and the memberships will be offered as prizes for the residents of Denman Prospect.

"It's a great honour to help the Raiders reach 20,000 members, and as Denman Prospect we've been great supporters of the Raiders and we're proud to be a sponsor," Mr Byron said. "We've bought these last few memberships and we'll be handing them out to residents of Denman Prospect as part of a competition.

"There's many Raiders members out there (Denman Prospect) already, but we'll be handing out a few more in Denman Prospect which has been a proud sponsor of the Raiders for the last few years."

Canberra Raiders CEO, Don Furner, said the Raiders were thrilled to reach 20,000 members for the first time in club history and thanked Mr Byron and Denman Prospect for their continued support.

"To reach 20,000 members is a very significant achievement for the club and we thank each and everyone of the 20,000 people who've decided to come on board and be a part of our club this season," Mr Furner said. "With only a handful of memberships required to reach 20,000 it was fantastic to see Stephen and the team at Denman Prospect come forward and help us reach the mark and we thank them for their continued support."

The Raiders have officialy closed membership sales for the 2018 season and are in the process of determining the final number after the last weekend of being on sale. The club will reopen for 2019 membership in September.