Population estimates are produced using the cohort component method - the same method used by the Office for National Statistics, Northern Ireland, Australia and the United States.
The reference point of this method is the resident population on 30 June in the previous year. From here, population estimates are adjusted using birth, death records, prison and armed forces population as well as the movement of people in and out of Scotland from other parts of the UK and from overseas.
Any error in the population estimates is due to the lack of 100% accurate system monitoring internal and external migration. Currently the best proxy sources of migration are GP registration records and survey information.
National Records of Scotland (NRS) estimates the population of Clackmannanshire for 2021 was 51,540, an increase of -0.07% since 2011.
There were 26,344 females and 25,196 males resident in Clackmannanshire.
Between 2020 and 2021 2,110 people arrived in Clackmannanshire (1,660 from within Scotland, 310 from the rest of the UK and 130 from overseas), whereas 1,810 left the county and moved to other parts of Scotland (1,450), the rest of the UK (260) or left the country (90).
The median age of Clackmannanshire's residents is 45 years, slightly higher than for Scotland (42).
The table below illustrates gender composition in Clackmannanshire.
| Median age | Under 16 | Working age | Pensionable age | |
|---|---|---|---|---|
| Males | 44 | 4,547 | 16,013 | 4,636 |
| Females | 46 | 4,330 | 16,558 | 5,456 |
| All residents | 45 | 8,877 | 32,571 | 10,092 |
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