In the United States, Black individuals make up about 33% of the prison population, while White individuals make up about 30%. Hispanic individuals represent about 23% of the prison population.

The country with the largest per capita prison population is the United States with over 700 prisoners per 100,000 population. Interestingly Canada which is almost identical to the population demographics has only 1/7th of this rate.

The population of the United States is about 5.14% of the Earth's total population, as of 2009.

In 1910, the estimated prison population in the United States was around 64,000 inmates. This marked a significant increase from previous years, reflecting changes in crime rates, law enforcement practices, and societal attitudes towards punishment.

United States Postal Service's population is 574,001.