ONS Population & Migration Data Sources

This page includes links to the main population and migration estimates from the Office for National Statistics (ONS) and other Government Departments and related information.  The following all include a breakdown by age.  Regional and sub-regional data are available where indicated by "REG" and "SUB":

ONS Population Statistics Home Page - Links to current data sets of population estimates at all geographical levels.
http://www.statistics.gov.uk/popest

Mid Year Population Estimates to Local Authority (LA) Level (REG, SUB) - Annual release, usually in August, of the previous year's estimates, including broad components of change.
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=15106

Supporting information for local authorities on mid year population estimates (REG, SUB) - Non official information at a more detailed level than the standard estimates. Note the conditions of use. 

http://www.statistics.gov.uk/STATBASE/Product.asp?vlnk=14060

Quarterly Population Estimates (REG) - Experimental estimates published shortly after the end of each quarter.  Available for English regions.
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=13523

Super Output Area (SOA) Mid Year Population Estimates (SUB) - Experimental release for SOAs, consistent with LA estimates but published a few months later.
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=14357

Population Estimates by Ethnic Group (REG, SUB) - Experimental estimates for geographies to LA level, consistent with mid year estimates but published later.
http://www.statistics.gov.uk/StatBase/Product.asp?vlnk=14238

Sub-National Population Projections (REG, SUB) - Updated every two years, currently based on mid 2006 population estimates.
http://www.statistics.gov.uk/snpp

ONS Migration Statistics Home Page - Links to current data sets relating to migration, including from other Government departments
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=15108

Migration Statistics Quarterly Report (REG) - Summary of all the latest data from ONS, the Home Office and the Department for Work & Pensions.
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=15230

Local Area Migration Indicators Tool (REG, SUB) - Collects together data that relate to migration in local areas. Comparisons of indicators and of local areas.
http://www.statistics.gov.uk/statbase/product.asp?vlnk=15239

The quarterly report and indicators summarise information from specific sources such as the following:

National Insurance Number (NINO) Allocations to Adult Overseas Nationals (REG, SUB) - Adult overseas nationals registering for a NINO for the purposes of work, benefits or tax credits.
http://research.dwp.gov.uk/asd/asd1/niall/nino_allocation.asp

Population by Country of Birth and Nationality from the Annual Population Survey (REG, SUB) - Country of birth and nationality groupings at a local level.  More detail at national and regional level.
http://www.statistics.gov.uk/StatBase/Product.asp?vlnk=15147

Flag 4 GP registrations by Local Authority (REG, SUB) - Counts of codes which indicate an international in-migrant registering with an NHS GP
http://www.statistics.gov.uk/statbase/Product.asp?vlnk=15283

Internal Migration Estimates (REG, SUB) - Annual estimates (in, out and net) of migration within the UK
http://www.statistics.gov.uk/StatBase/Product.asp?vlnk=7070

IMPS: Improving Migration and Population Statistics Project - A research based project that investigates and implements improvements to methods and sources.
http://www.statistics.gov.uk/imps

ONS Population and Migration Methodology - Papers, reports and background notes
http://www.statistics.gov.uk/about/Methodology_by_theme/population.asp

ONS Population Trends - Quarterly commentary on the latest data. includes articles on population-related subjects.
http://www.statistics.gov.uk/statbase/product.asp?vlnk=6303