Age Structure (Irish 1821 classification)
| Age Groups used in 1821 Irish Census | 1821 |
|---|---|
| 0 to 4 |
4,567
|
| 5 to 9 |
4,451
|
| 10 to 14 |
3,709
|
| 15 to 19 |
3,767
|
| 20 to 29 |
4,893
|
| 30 to 39 |
3,271
|
| 40 to 49 |
1,941
|
| 50 to 59 |
1,519
|
| 60 to 69 |
610
|
| 70 to 79 |
141
|
| 80 to 89 |
20
|
| 90 to 99 |
3
|
| 100 Up |
0
|
| Age unknown |
8
|
| Date: | Source: |
|---|---|
| 1821 | 1821 Census of Ireland, Abstract of answers, Table [2] , 'Ages of Persons' |
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The only information provided by the first three censuses was a three-way categorisation of families. In 1831, this more detailed categorisation was published, although it was limited to males aged 20 and over (although numbers of male servants under 20, and of female servants, were also listed). These are the most detailed parish-level occupational data ever published by the census. Information on the precise occupations of workers in retail trade and handicrafts was also published at county-level.