Situated at Laredo National Bank, Laredo, TX. It’s 308 feet high (92.96 meters), and flies a 100 ft. by 50 ft. (30.48 x 15.24 meters) flag and costed 300.000$ to build.
On the other side of the border in Nuevo Laredo, Mexico is the tallest mexican flag.
http://www.flagsbay.com/flag/2008/08/22/the-stars-and-stripes-flying-high-in-laredo-texas/