dad4boys - JUCOs recruit just like any four year school. They receive reports from scouts (including the draft and follows as H pointed out), coaches, and they scout their own games as well. Many JUCOs will also have open tryouts.
My freshman JUCO son receieved JUCO offers from schools in IL, TN, and AL. We're in KY which only has one JUCO. Those coaches work hard just like the four year coaches in their recruiting.