| Clue | Source | Date |
|---|---|---|
| Head counts 100 eastern Poles on applications | The Telegraph Toughie | 23 May 2025 |
| Nationwide household surveys | ||
| Official periodic counts of a population (8) | ||
| Periodic population counts | Irish Times Simplex | 12 Jan 2022 |
| In which we are all down for the count every ten years | The Times Specialist Sunday | 26 Aug 2018 |
| Periodic population counts | Irish Times Simplex | 20 Feb 2016 |
| Big counting jobs | ||
| Once-a-decade events |