The Independent candidate polled 51,930 votes and runner up was Conservative Nick King with 34,451.
The first round of vote counting finished earlier at the Lighthouse in Poole.
No candidate received more than 50 per cent of the vote. The second choices of those who voted for Andrew Canning and Rachel Rogers were then counted.
The first round results were: Andrew Canning, Liberal Democrat, poled 9,963 votes, Nick King, Conservative, received 31,165 votes, Rachel Rogers, Labour, poled 11,596 votes and Martyn Underhill, Independent, received 43,425.