Northallerton was a parliamentary borough in the North Riding of Yorkshire, represented by two Members of Parliament in the House of Commons briefly in the 13th century and again from 1640 to 1832, and by one member from 1832 until 1885.
As in most other burgage boroughs, the ownership of the burgages had early become concentrated in the hands of a single family, who in effect had a free hand to nominate both MPs.
Under the Reform Act, the boundaries were extended to include neighbouring Romanby and Brompton, increasing the population to 4,839, and its representation was reduced to a single member.
At the 1885 election, the constituency was abolished, being absorbed into the new Richmond division of the North Riding.
Northallerton re-enfranchised by Parliament, Nov 1640 The election was declared void on petition, due to bribery by agents, causing a by-election.