Uxbridge became Lord Lieutenant of Anglesey in 1782. On 19 May 1784 he was created Earl of Uxbridge, in the County of Middlesex. He was also Lord Lieutenant of Staffordshire between 1801 and 1812, Constable of Caernarfon Castle, Ranger of the Forest of Snowdon, Steward of Bardney, and Vice-Admiral of North Wales.