DALLAS – Webb County, Tex., which includes Laredo on the Texas-Mexico border, earned a Standard & Poor’s upgrade to AA from AA-minus in advance of a $21.9 million issue of certificates of obligation.

"The raised rating is based on our view of the county's continued economic growth and diversification, as well as its maintenance of a very strong financial position," said S&P analyst Kate Choban. The outlook is stable.

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