98.9% of US, but 100% of Ohio

ALA | U.S. Public Libraries Providing Unprecedented Access to Computers, the Internet, and Technology Training

"New data shows that 98.9 percent of all public libraries offer free public access to computers and the Internet—a growth of more than 400 percent since 1996, when just one in four libraries did."

The report also says that for about half the systems studied (50.6%), technology budgets have stayed level with no increases for inflation. More than one in 10 systems reported a decrease. It compares differences between urban and rural districts and between different states, and discusses training programs.

Also reported in the New York Times.