Colac’s population Proposal for Colac’s growth Colac district residents have proposed 10 areas for residential development to allow for Colac’s population growth of 12,000 forecast over the next 30-plus years. By Colac Herald ContributorMarch 19, 2018 Jury guides Colac growth A “jury” of Colac residents will help Colac Otway Shire Council plan for Colac’s residential growth. By A Staff ReporterMay 29, 2017