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The average daily inmate population of New York City Department of Correction (NYCD) is approximately 11,400 individuals. This is more than the population of many state correctional systems.

Most of the inmates in NYCD custody are housed on Rikers Island, which has 10 jails that together can house as many as 15,000 inmates at once. The Rikers facilities include a jail for sentenced males, another for sentenced and detainee females, and a detention center for adolescent males (ages 16 to 18). The seven other jails on the Island house adult male detainees. Other Island features include a bakery, central laundry, tailor shop, print shop, maintenance and transportation divisions, K-9 unit and a power plant.

http://www.nyc.gov/html/doc/html/about/facilities-overview.shtml