The following UK Prime Ministers attended university at either Oxford or Cambridge. Thus, of the 57 Prime Ministers to date, 43 studied at Oxbridge, 11 did not go to university (most recently Winston Churchill and John Major), and only 3, Earl Russell, Neville Chamberlain, and Gordon Brown, went to other universities (Edinburgh, Birmingham and Edinburgh respectively).

14 attended Cambridge (including 6 at Trinity), and 28 attended Oxford (including 14 at Christ Church). For more info on UK Prime Ministers, try Wikipedia.

PM	PM dates	College
Robert Walpole	1721-1742	King's, Cambridge
Earl of Wilmington	1742-1743	Trinity, Oxford
Henry Pelham	1743-1746	Hart Hall, Oxford
Earl of Bath	1746	Christ Church, Oxford
Duke of Newcastle	1754-1756	Clare, Cambridge
George Grenville	1763-1765	Christ Church, Oxford
Marquess of Rockingham	1765-1766 1782	St John's, Cambridge
Earl of Chatham	1766-1768	Trinity, Oxford
Duke of Grafton	1768-1770	Peterhouse, Cambridge
Lord North	1770-1782	Trinity, Oxford
Earl of Shelburne	1782-1783	Christ Church, Oxford
Duke of Portland	1783 1807-1809	Christ Church, Oxford
William Pitt	1783-1801 1804-1806	Pembroke, Cambridge
Henry Addington	1801-1804	Brasenose, Oxford
Baron Grenville	1806-1807	Christ Church, Oxford
Spencer Perceval	1809-1812	Trinity, Cambridge
Earl of Liverpool	1812-1827	Christ Church, Oxford
George Canning	1827	Christ Church, Oxford
Viscount Goderich	1827-1828	St John's, Cambridge
Earl Grey	1830-1834	Trinity, Cambridge
Viscount Melbourne	1834	Trinity, Cambridge
Robert Peel	1841-1846	Christ Church, Oxford
Earl of Derby	1852 1858-1859 1866-1868	Christ Church, Oxford
Earl of Aberdeen	1852-1855	St John's, Cambridge
Viscount Palmerston	1855-1858 1859-1865	St John's, Cambridge
William Gladstone	1868-1874 1880-1885 1886 1892-1894	Christ Church, Oxford
Marquess of Salisbury	1885-1886 1886-1892 1895-1902	Christ Church, Oxford
Earl of Rosebery	1894-1895	Christ Church, Oxford
Arthur Balfour	1902-1905	Trinity, Cambridge
Henry Campbell-Bannerman	1905-1908	Trinity, Cambridge
Herbert Asquith	1908-1916	Balliol, Oxford
Stanley Baldwin	1923-1924 1924-1929 1935-1937	Trinity, Cambridge
Clement Atlee	1945-1951	University, Oxford
Anthony Eden	1955-1957	Christ Church, Oxford
Harold Macmillan	1957-1963	Balliol, Oxford
Alec Douglas-Home	1963-1964	Christ Church, Oxford
Harold Wilson	1964-1970 1974-1976	Jesus, Oxford
Edward Heath	1970-1974	Balliol, Oxford
Margaret Thatcher	1979-1990	Somerville, Oxford
Tony Blair	1997-2007	St John's, Oxford
David Cameron	2010-2016	Brasenose, Oxford
Theresa May	2016-2019	St Hugh's, Oxford
Boris Johnson	2019-	Balliol, Oxford