The 'AA+' rating on Polk County, Iowa's GO bonds and GO capital loan notes reflects the county's: Participation in the strong and diverse Des Moines, Iowa MSA economy; Consistently strong financial performance; and Moderate overall net debt levels. The county's full faith and credit pledge secures both the GO bonds and the capital loan notes. The county's moral obligation pledge secures Polk County Health Services' ('A+') bonds outstanding. Polk County forms the base of the Des Moines MSA, which is a growing and diversified regional economic center in central Iowa. Substantial economic development projects in West Des Moines and Des Moines have been at the forefront of the county's growth. However, the county has planned infrastructure improvements in the eastern