NEW YORK (Standard&Poor's CreditWire) July 11, 2000-- Standard&Poor's today assigned its single-'A' rating to Orange County, Fla.'s $300 million tourist development tax revenue bonds series 2000 due Oct. 1, 2031. The bonds are scheduled to sell July 25, 2000. The outlook is stable. In addition, Standard&Poor's affirmed its single-'A' underlying rating (SPUR) on the county's tourist development tax revenue bonds series 1998A and 1998B and tourist development tax revenue refunding bonds series 1997A. The bonds and the outstanding bonds are special obligations of the county. The bonds are secured by the tourist development tax (TDT) levied at a rate of 5% of each dollar charged for tourist rentals, which is comprised of the 4%