| block_group2000 | Centers of population of US census tracts according to the 2000 census | 
| block_group2010 | Centers of population of US census block groups according to the 2010 census | 
| block_group2020 | Centers of population of US census block groups according to the 2020 census | 
| county2000 | Centers of population of US counties according to the 2000 census | 
| county2010 | Centers of population of US counties according to the 2010 census | 
| county2020 | Centers of population of US counties according to the 2020 census | 
| state2000 | Centers of population of US states according to the 2000 census | 
| state2010 | Centers of population of US states according to the 2010 census | 
| state2020 | Centers of population of US states according to the 2020 census | 
| tract2000 | Centers of population of US census tracts according to the 2000 census | 
| tract2010 | Centers of population of US census tracts according to the 2010 census | 
| tract2020 | Centers of population of US census tracts according to the 2020 census | 
| US_mean_center2010 | Mean and Median centers of population of the US | 
| US_mean_center2020 | Mean and Median centers of population of the US | 
| US_median_center2010 | Mean and Median centers of population of the US | 
| US_median_center2020 | Mean and Median centers of population of the US |