<page_title> Combined authority </page_title> <section_title> Existing combined authorities </section_title> <table> <cell> Greater Manchester <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Bolton <col_header> Constituent districts </col_header> <col_header> Mayoral </col_header> </cell> <cell> 1 April 2011 <col_header> Established </col_header> <col_header> Mayoral </col_header> </cell> <cell> Bury <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Oldham <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Rochdale <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Salford <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Stockport <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Tameside <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Trafford <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> <cell> Wigan <col_header> Combined authority </col_header> <col_header> Mayoral </col_header> </cell> </table>
There were nine authorities, with the Greater Manchester Combined Authority established on 1 April 2011.