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| 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 |
| county2000 | Centers of population of US counties according to the 2000 census |
| county2010 | Centers of population of US counties according to the 2010 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 |
| 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 |
| US_mean_center2010 | *Mean* center of population of the US according to the 2010 census |
| US_median_center2010 | *Median* center of population of the US according to the 2010 census |