At the 2016 elections, Unionist parties totalled 20,185 votes which was 6,663 more votes than the nationalist parties.
At the 2021 election, if everyone tactically voted for LABOUR, it would keep the SNP out of the Constituency
Dumbarton is a constituency of the Scottish Parliament (Holyrood). It elects one Member of the Scottish Parliament (MSP) by the first past the post method of election
West Scotland is one of the eight electoral regions of the Scottish Parliament. Ten of the parliament's 73 first past the post constituencies are sub-divisions of the region and it elects seven of the 56 additional-member Members of the Scottish Parliament (MSPs). Thus it elects a total of 17 MSPs.
From the 2011 Scottish Parliament election, Dumbarton had its boundaries altered to include the following electoral wards: From West Dunbartonshire: Dumbarton, Leven, Lomond. From Argyll and Bute: Lomond North, Helensburgh Central, Helensburgh and Lomond South