On the 12 May 2016 the formation of the following 19 councils proceeded:
- Armidale Regional Council : The merger of Armidale Dumaresq and Guyra Shire councils
- Canterbury-Bankstown Council : The merger of Bankstown City and Canterbury City councils
- Central Coast Council : The merger of Gosford City and Wyong Shire councils
- City of Parramatta Council : The merger of Parramatta City*, The Hills Shire*, Auburn City*, Holroyd City* and Hornsby Shire* councils
- Cumberland Council : The merger of Parramatta City*, Auburn City* and Holroyd City* councils
- Edward River Council : The merger of Conargo Shire and Deniliquin councils
- Federation Council : The merger of Corowa Shire and Urana Shire councils
- Georges River Council : The merger of Hurstville City and Kogarah City councils
- Gundagai Council : The merger of Cootamundra Shire and Gundagai Shire councils
- Hilltops Council : The merger of Boorowa, Harden Shire and Young Shire councils
- Inner West Council : The merger of Ashfield, Leichhardt Municipal and Marrickville councils
- Mid-Coast Council : The merger of Gloucester Shire, Great Lakes and Greater Taree City councils
- Murray River Council : The merger of Murray Shire and Wakool Shire councils
- Murrumbidgee Council : The merger of Jerilderie Shire and Murrumbidgee Shire councils
- Northern Beaches Council : The merger of Manly, Pittwater and Warringah councils
- Queanbeyan-Palerang Regional Council : The merger of Palerang and Queanbeyan City councils
- Snowy Monaro Regional Council : The merger of Bombala, Cooma-Monaro Shire and Snowy River Shire councils
- Snowy Valleys Council : The merger of Tumbarumba Shire and Tumut Shire councils
- Western Plains Regional Council : The merger of Dubbo City and Wellington councils
The following merger proposals are still pending a court decision:
- Armidale Dumaresq, Guyra Shire, Uralla Shire and Walcha councils
- Bathurst Regional and Oberon councils
- Blayney Shire, Cabonne and Orange City councils
- Burwood, City of Canada Bay and Strathfield Municipal councils
- City of Botany Bay and Rockdale City council
- Dungog Shire and Maitland City councils
- Hornsby Shire* and Ku-ring-gai councils
- Hunter’s Hill, Lane Cove and City of Ryde councils
- Mosman Municipal, North Sydney and Willoughby City councils
- Newcastle City and Port Stephens councils
- Randwick City, Waverley and Woollahra Municipal councils
- Shellharbour City and Wollongong City councils