Following the publication of 2021 Census estimates, NISRA population statistics carried out a rebasing exercise to revise the population estimates time series from 2012 to 2020 in line with the most recent Census 2021 population estimates.
The rebased time series up to 2021 was published on 29 June 2023. Subsequent mid-year population and migration estimates have been rolled forward from Census 2021.
The most recent 2024 mid-year population and migration estimates for Northern Ireland and the 11 Local Government Districts within Northern Ireland, including estimates of those aged 85 and over, by single year of age up to 104 years, and for those aged 105 and over were published on 11 September 2025.