San Juan County Of--extension Svcs Monticello, UT 84535 Phone : (435) 587-3239 Business Category Schools-Universities & Colleges Schools San Juan County Extension Service Monticello, UT 84535 Phone : (435) 587-3239 Business Category Government Offices-County Legislative Bodies Utah State University Extnsv 117 S Main Monticello, UT 84535 Phone : (435) 587-3239 Business Category Schools-Universities & Colleges Schools