In 1801, the
civil parishes that form the modern borough had a total population of 65,721. This rose steadily throughout the 19th century, as the district became built up; exceeding 200,000 in the middle of the century. When the railways arrived the rate of
population growth increased—reaching nearly 400,000 by the turn of the century; with the
Metropolitan Borough of Finsbury particularly suffering deprivation, poverty and severe overcrowding. The increase in population peaked before
World War I, falling slowly in the aftermath until
World War II began an exodus from London towards the
new towns under the
Abercrombie Plan for London (1944). The decline in population reversed in the 1980s, but it remains below its 1951 level. According to the
2001 census Islington had a population of 175,797. It was 75% White, including 5% White Irish, 6% Black African, 5% Black Caribbean and 2% Bangladeshi. Thirty-two per cent of the borough's residents were owner–occupiers. According to the
2011 census, Islington has the highest population density of local authorities in England and Wales—13,875 people per square kilometre. Islington has the second highest proportion of
Irish people in the country, behind
London Borough of Brent. A 2017 study by
Trust for London and the
New Policy Institute found that a third of Islington residents lived in poverty. This is above the London average of 27%. It also found that 14% of local employees were in jobs which pay below the London Living Wage – the fourth lowest figure of any London borough. 39% of the borough's residents identified as Christian, 12.8% Muslim, 1.7% Jewish and 42.7% had no religion. Christians and Muslims live throughout the borough, while the Jewish population is most concentrated in the north of the borough in the Hillrise and Junction wards (bordering
Highgate and
Crouch End).
Ethnicity The following table shows the ethnic group of respondents in the 2001, 2011 and 2021 censuses in Islington.
Religion The following shows the religious identity of residents residing in Islington according to the 2001, 2011 and the 2021 censuses. ==Education==