Presents data on numbers of jails and jail inmates at midyear 2009 and analyzes patterns of growth from 2000 through 2009. These statistical tables include data on rated capacity of jails, percent of capacity occupied, and capacity added. They provide estimates of admissions to jails and detail the volume of movement among the jail population. This web document also includes total numbers for jail inmates by sex, race, and Hispanic origin. Standard errors for jail estimates are included.