From its first known general election in 1542 until 1918, the constituency consisted of a number of boroughs within the historic county of Flintshire in north-east Wales. The seat should not be confused with the county constituency of Flintshire, which existed from the 16th century until 1950.
After 1918 Flintshire was represented in Parliament by the single member county constituency, which included all the boroughs formerly in the Flint District of Boroughs.
Flint 1535–1832
On the basis of information from several volumes of the History of Parliament, it is apparent that the history of the borough representation of Wales and Monmouthshire is more complicated than that of the English boroughs.
The Laws in Wales Act 1535 (26 Hen. 8. c. 26) provided for a single borough seat for each of 11 of the 12 Welsh counties and Monmouthshire. The legislation was ambiguous as to which communities were enfranchised. The county towns were awarded a seat, but these seats in some way represented all the ancient boroughs of the county, as the boroughs other than county towns were also required to contribute to the members' wages. It is not clear whether the burgesses of the contributing boroughs could vote in the election. The only election under the original scheme was that for the 1542 parliament. It seems that only burgesses from the county towns actually took part. The Parliament Act 1543 (35 Hen. 8. c. 11) confirmed that the contributing boroughs could send representatives to take part in the election at the county town. As far as can be told from surviving indentures of returns, the degree to which the out boroughs participated varied, but by the end of the 16th century all the seats had some participation from them at some elections at least.
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 the case of Flintshire, the county town was Flint. The out boroughs were Caergwrle, Caerwys, Overton and Rhuddlan.
In 1690–1715 the freemen of the five boroughs were entitled to vote. The exact number is unknown, but in the only poll of the period (a by-election in 1697) there were 760 voters.
Between 1715 and 1754 the House of Commons changed the franchise of the constituency. In 1727 there were about 1000 freemen entitled to vote. Thereafter the inhabitants of the five boroughs, paying scot and lot (a local tax), formed the electorate. They numbered about 600.
From 1754 to 1790, there were still about 600 voters. Namier and Brooke point out that the constituency was controlled by local squires. No election went to a poll in that period.
Flint Boroughs 1832–1918
The Flint Boroughs was a district of boroughs constituency, which grouped a number of parliamentary boroughs in Flintshire into one single member constituency. 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 eight boroughs of Flint, Caergwrle, Caerwys, Holywell, Mold, Overton, Rhuddlan and St Asaph.
The boundaries of the parliamentary boroughs in the district were altered by the Parliamentary Boundaries Act 1868, but the general nature of the constituency was unchanged. There were no further boundary changes in the 1885 redistribution of parliamentary seats.
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