EVERETT — Credit rating group Standard &Poor’s has upgraded Snohomish County’s bond rating to AA+ from AA, citing the county’s strong management, the strength of the local economy, liquidity and budgetary flexibility and performance.

An improved credit rating enables the county to obtain better terms when it borrows money, saving the county and taxpayers money in the long run, especially in interest payments. The upgrade is for the county’s limited-tax general obligation bonds.