The rollout of the National Broadband Network is a step closer to completion with nearly 3 in 4 Australian homes and businesses now able to connect.

More than 8 million homes and businesses are now able to order a service from their preferred retailer, with a further 628,000 set to be able to connect by the end of June.

Katherine Dyer from NBN Co says they're on-track to complete the rollout by 2020.