"At midyear 2010, a total of 2,119 inmates were conned in Indian country jails, a 2.6% decrease from the 2,176 inmates conned at midyear 2009. This count was based on data from 75 facilities, including jails, confinement facilities, detention centers, and other correctional facilities that were operating in Indian country at midyear 2010. For 2009, the number of inmates was based on data for 79 facilities in operation at midyear 2009. Between 2004 and 2010, the number of inmates held in Indian country jails increased by 21%, from 1,745 to 2,119. On June 30, 2010, the number of American Indians and Alaska Natives conned in jails outside of Indian country (9,900) was nearly 5 times the number held in jails in Indian country."
Bureau of Justice Statistics: http://www.bjs.gov/