He fought off stiff competition from 10 other candidates to win the post.
The new mayor's winning policies include:
- opening a booze free bar to help keep kids off the streets
- improving sports facilities
- producing a regular newsletter to keep young people up to date
Adam, 15, also won our vote on CBBC Newsround Online - he scooped over 16 per cent of your votes.
£30, 000 cash to spend