From its first known general election in 1542 until 1885, the constituency consisted of a number of boroughs within the historic county of Pembrokeshire in Wales.
8. c. 11) confirmed that the contributing boroughs could send representatives to take part in the election at the county town.
The original scheme was modified by later legislation and decisions of the House of Commons (which were sometimes made with no regard to precedent or evidence: for example in 1728 it was decided that only the freemen of the borough of Montgomery could participate in the election for that seat, thus disenfranchising the freemen of Llanidloes, Welshpool and Llanfyllin).
In 1690–1832 the freemen of the three remaining boroughs of Pembroke, Tenby, and Wiston were entitled to vote.
The voters from each participating borough cast ballots, which were added together over the whole district to decide the result of the poll.
The enfranchised communities in this district, from 1832, were the four boroughs of Pembroke, Milford, Tenby, and Wiston.
As there were sometimes significant gaps between Parliaments held in this period, the dates of first assembly and dissolution are given.
Where the name of the member has not yet been ascertained or (before 1558) is not recorded in a surviving document, unknown is entered in the table.