| Clue | Source | Date |
|---|---|---|
| Source of American demographic info | Universal | 28 Aug 2025 |
| Govt. count performed once every decade | Universal | 15 Sep 2022 |
| The 23rd one took place in 2010 | New York Times | 30 Mar 2019 |
| The 23rd one took place in 2010 | ||
| Every-decade count | Wall Street Journal | 20 Jan 2017 |
| Decennial govt. activity | ||
| Decennial govt. activity |