Standard&Poor's Ratings Services raised its long-term and underlying rating (SPUR) to 'AA+' from 'AA' on Lake County Consolidated High School District No. 120 (Mundelein), Ill.'s existing general obligation (GO) bonds. At the same time, Standard&Poor's raised its long-term rating and SPUR to 'AA' from 'AA-' on the district's existing debt certificates. The outlook on all ratings is stable. The raised ratings reflect our view of the consistent improvement in the district's financial position during the past several years coupled with management's anticipation of positive operations for the next few years. The 'AA+' GO rating reflects our assessment of the district's: Participation in the Chicago metropolitan statistical area's (MSA) deep and diverse economy; Very strong incomes and