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Provisional results just released show Mr Cadogan received 7093 votes compared to his mayoral challenger Victoria Bonham, who received 839 votes.
Ms Bonham, who was a first term councillor, had also stood this term for the Central Otago District Council's Vincent ward and Vincent Community Board, but failed to win seats in either.
The progress result does not include some special votes and votes returned today that are still in transit to the processing centre.
The council spokesman said all candidates were being contacted to let them know the results first before they were publicly announced.
Mr Cadogan, who will now begin his second term as mayor, said he was "absolutely humbled" by "the support and trust" he had been shown.
"I'm really looking forward to the next three years to continuing to work hard for all of Central Otago."
Ms Bonham congratulated Mr Cadogan, and thanked those who encouraged her to stand for the mayoralty