In the general census of 1800 there were no returns from Derry.

But in 1814 it was stated in a report by the deputation from the Irish Society, that the population amounted at that time to 14,087 persons.

This must have included the suburbs.

In the census of 1821 the city was found to have 9,313 inhabitants.

The city and suburbs together contained 16,971.
The report of the commissioners of public instruction in 1831 made a startling disclosure as to the effect of the system of exclusion in this 'branch of the City of London.' In the parish of Templemore (part of) there were-- Members of the Established Church 3,166 Presbyterians 5,811 Roman Catholics 9,838 The report of 1834 gave the Roman Catholics, 10,299; the Presbyterians, 6,083; and the Church only 3,314.
The figures now are--Catholics 12,036 Protestants of all denominations 8,839 Majority of Irish and Catholics in this 'branch of the City of London' 3,197 This majority is about equal to the whole number which the exclusive system, with all its 'protection' and 'bounties,' could produce for the Established Church in the course of two centuries! If the Irish had been admitted to the Pale of English civilisation, and instructed in the industrial arts by the settlers, the results with respect to religion might have been very different.