Moody’s Investors Service upgraded Mannheim School District 83 in Cook County, Ill., to Aa3 from A1, affecting $21.2 million of outstanding general obligation limited-tax debt.

The rating upgrade is based on an improved financial position marked by consecutive years of large operating surpluses. The Aa3 rating also factors in a moderately sized, mature tax base, located in Aa2-rated Cook County.

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