As of the 2010 Census, the population was 501,226, reflecting an increase of 12,177 (+2.5%) from the 489,049 counted in the 2000 Census, retaining its position as the state's ninth-most populous county.

Nearly another 100,000 people were counted in the 2010 Census, which recorded the town's population at 208,453.

The Navajo Reservation is the nation's largest, in both size and population - more than 105,000 counted in the 1980 Census, and substantially more today.

At the same time, Mayor Koch told a Congressional panel in Manhattan that the law might discourage illegal aliens from being counted in the 1990 Census, driving them further underground.

The population declined by 809 (-37.8%) from the 2,143 counted in the 2000 Census, which had in turn increased by 334 (+18.5%) from the 1,809 counted in the 1990 Census.

However, this referendum gave the Commonwealth powers to make laws with respect to the Aboriginal people and counted them in the Census.

As of the 2010 Census, the county's population was 66,083, increasing by 1,798 (+2.8%) from the 64,285 counted in the 2000 Census, retaining its position as the state's least populous county.

The 2002 US Census counted 6 Kutenai speakers in the United States and the 2011 Canadian Census counted 100 speakers.

These were not counted in the Census, as most of them lived on their ships.

Most foreigners in Mexico counted in the Census come from the United States or other Hispanophone countries.