1664, and for Westminster until 1680. He was Commissioner for assessment for Lincolnshire from 1664 to 1680, and a Commissioner for enclosures for Deeping fen in 1665. In 1670 he became Deputy lieutenant for Lincolnshire and in 1671 a Commissioner for concealments. In Parliament he was chairman of the committee of elections and privileges from 8 February 1673 to 30 December 1678. He was a Commissioner for recusants in 1675 and an assistant to the Sons of the Clergy in 1678. Meres was re-elected MP for Lincoln at the first general election of 1679 and was chairman of the committee of elections and privileges from 19 March to 27 May 1679. He was returned again at the second general election of 1679. He was a Lord of the Admiralty from 1679 to 1684 and a Commissioner for assessment for Essex, Leicestershire and London from 1679 to 1680. By 1680 he was a captain in the foot militia. He was returned in a contest as MP for Lincoln at the 1681 English general election and also became a Justice of the Peace for Holland in 1681. He was unopposed at the 1685 English general election. He lost his position as Deputy Lieutenant and on the Commissions of the Peace in 1688 after the Test Acts. After the Glorious Revolution, in October 1688, Meres was restored to the Commission of the Peace as JP for Lindsey and Kesteven and was Commissioner for assessment for Lincolnshire in 1689. By 1689 he had lost his support at Lincoln and did not stand for the Parliaments in that year. He was restored as deputy lieutenant for Lincolnshire in 1691 and was appointed a Commissioner for rebuilding St Paul's in 1692. He stood for Lincoln at the 1695 English general election and at the 1698 English general election but was unsuccessful on both occasions. In 1696 he was vice-president of the Sons of the Clergy. He was appointed a Commissioner for collecting subscriptions to the land bank in 1699. Meres was eventually returned as MP for Lincoln in a contest at the first general election of 1701 but did not stand at the second election of that year. He was returned for Lincoln in a contest at the 1702 English general election. At the 1705 English general election, he was returned for Lincoln unopposed and voted against the Court candidate for Speaker on 25 October 1705.