Flow Data Information System

1991 Census: MIGPOP Migration data

The 1991 SMS refer to counts of individuals who were in existence 12 months before the Census and who were resident at a different usual residence on 21 April 1991 to that a year previously.

MIGPOP data are counts derived from a subset of SMS Set 2 containing migration flows within and between districts in Great Britain. There were 459 districts in 1991 (366 in England, 37 in Wales and 56 in Scotland).

All the 1991 SMS data have been derived from the 100% sample and include imputed households. However, OPCS suppressed certain migrant data in the SMS Set 2 in order to ensure confidentiality. Tables 1 and 2 contain unsuppressed counts. However, the imposition of suppression thresholds means that many smaller flows are not available in Tables 3-10. Phil Rees and Oliver Duke-Williams (1997) have estimated data for suppressed flows using various estimation methods.

Ludi Simpson and Erica Middleton identified a number of further elements missing from the SMS data and have adjusted the flows corrected for suppression by Rees and Duke-Williams in Table 3 with the 15-19 year olds as a single group. The estimation for underenumeration methodology and its implications are outlined in a paper in the International Journal of Population Geography (Simpson and Middleton, 1999).

Users can choose from 36 counts in Table 3 of migrants by age group and sex.

References

Flowerdew, R. and Green, A. (1993) Migration, transport and workplace statistics from the 1991 Census, in Dale, A. and Marsh, C. (eds) The 1991 Census User's Guide, HMSO, London: 269-94.

Rees, P.H. and Duke-Williams, O. (1995) The story of the British Special Migration Statistics, Scottish Geographical Magazine, 11: 13-26.

Rees, P.H. and Duke-Williams, O. (1997) Methods for estimating missing data on migrants in the 1991 British Census, International Journal of Population Geography, 3: 323-368.

Simpson, S. and Middleton, E. (1999) Undercount of migration in the UK 1991 Census and its impact on counterurbanisation and population projections, International Journal of Population Geography, 5: 387-405.

Citation information

The following statements should be attached to all output produced using this data set

Data from this set should be cited in a bibliography as:

Office for National Statistics, 1991 Census: MIGPOP Migration data [computer file], UK Data Service

Further information

This data type is derived from:

The following pre-defined totals are available from this data set:

There are 1 tables defined for this data set:

The data are available for the following geographies:

Geographies of origin areasGeographies of destination areas
Supported directly
[i]GB Districts 1991
[i]GB Counties 1991
[i]GB Standard Regions 1991
[i]CIDS 1991/2001 common geography - 'districts'
[i]CIDS 1991/2001 common geography - 'intermediate'
[i]CIDS 1991/2001 common geography - '100 zones'
[i]CIDS 1991/2001 common geography - 'city regions'
[i]GB Districts 1991
[i]GB Counties 1991
[i]GB Standard Regions 1991
[i]CIDS 1991/2001 common geography - 'districts'
[i]CIDS 1991/2001 common geography - 'intermediate'
[i]CIDS 1991/2001 common geography - '100 zones'
[i]CIDS 1991/2001 common geography - 'city regions'
Supported via aggregation
[i]GB Countries 1991
[i]GB Standard Region Urban / Rural components
[i]DETR 99 zone system
[i]Great Britain
[i]GB Countries 1991
[i]GB Standard Region Urban / Rural components
[i]DETR 99 zone system
[i]Great Britain

Output for geographies that are only supported via aggregation will take longer than for those supported directly

Table frameworks


Table 3: All migrants: age (5 year groups) by sex
Male Female
1-4 1 19
5-9 2 20
10-14 3 21
15-19 4 22
20-24 5 23
25-29 6 24
30-34 7 25
35-39 8 26
40-44 9 27
45-49 10 28
50-54 11 29
55-59 12 30
60-64 13 31
65-69 14 32
70-74 15 33
75-79 16 34
80-84 17 35
85+ 18 36