West Dunbartonshire covered the Helensburgh, Old Kilpatrick, and Vale of Leven districts of the county and the burghs of Cove and Kilcreggan, Dumbarton and Helensburgh.[2]
For the 1951 general election the constituency boundaries were adjusted to take account of a change to the boundaries of the Old Kilpatrick district.[2]
The results of the Second Periodical Review were implemented for the February 1974 general election. The review took account of population growth in the county of Dunbarton, caused by overspill from the city of Glasgow into the new town of Cumbernauld and elsewhere,[citation needed] and West Dunbartonshire became one of three constituencies covering the county. The other two were East Dunbartonshire and Central Dunbartonshire. West Dunbartonshire now covered the Helensburgh and Vale of Leven districts and the burghs of Cove and Kilcreggan, Dumbarton and Helensburgh.[2]
The Fifth Periodical Review did not affect the boundaries of Scottish Parliament constituencies, which retain the boundaries of Westminster constituencies prior to implementation of the results of the review.