The new borough consisted of Penryn, Falmouth and parts of Budock and St Gluvias parishes, giving it a mostly urban population of nearly 12,000, of whom 875 were registered to vote at its first election in 1832.
At this period its voters were politically unpredictable; though generally among the more Conservative Cornish constituencies, they were influenced by personal factors and often swung against the national tide of opinion.
Falmouth, which had a stronger non-conformist presence, was the more Liberal part of the constituency in the late 19th century, but was thought to become more Conservative as it developed its economy as a destination seaside resort.
This was a much more extensive constituency, covering the whole of south central Cornwall, including the towns of Truro and St Austell as well a long stretch of coastline.
The constituency had a more industrial character (a sixth of the population were engaged in tin mining); the area suffered badly from unemployment in the 1930s, and in 1935 the Labour Party came within 3,031 votes of winning what would have been their first seat in Cornwall.