Business Loop Interstate 35 is a north-south highway along Interstate 35 in Northern Denton County. this highway is not labeled on the Texas Atlas & Gazetteer from DeLorme, or the 2003 Official Travel Map from the Texas Department of Transportation.
The web-site AA Roads states the following about BUSN Loop I-35 at Sanger.
"Business Loop I-35X from Interstate 35 north of Sanger southerly to Interstate 35 in south Sanger, a distance of approximately 1.80 miles in Denton County." -BUSN. Routes/Interstate 35 @ AA Roads.com BGS on NB I-35.