Lord Lansdowne holds the subsidiary titles of Earl Wycombe, of Chipping Wycombe in the County of Buckingham (1784), Earl of Kerry (1723), Earl of Shelburne (1753), Viscount Calne and Calstone (1784), Viscount Clanmaurice (1723), Viscount FitzMaurice (1751), Baron Wycombe, of Chipping Wycombe in the County of Buckingham (1760), Baron Kerry and Lixnaw (1223), and Baron Dunkeron (1751). The subsidiary titles are all in the Peerage of Ireland, except for the Earldom and Barony of Wycombe and the Viscountcy of Calne and Calstone, which are in the Peerage of Great Britain. The courtesy title for the Lord Lansdowne's eldest son and heir alternates between Earl of Kerry and Earl of Shelburne.
On the death without issue of Sir William Petty’s sons, the first Earls of Shelburne, the estates passed to his nephew John Fitzmaurice (advanced in 1753 to the earldom of Shelburne), who in 1751 took the additional name of Petty.
Shelburne joined the Grenville ministry in 1763 as First Lord of Trade, but, failing in his efforts to include Pitt in the cabinet, he in a few months resigned office.
In June of 1768 the General Court incorporated the district of Shelburne, Massachusetts from the area formerly known as “Deerfield Northwest” and in 1786 the district became a town.