High Quality Content by WIKIPEDIA articles! Interstate 610 (abbreviated I-610) is a freeway that forms a 38-mile-long (61 km) loop around the downtown sector of city of Houston, Texas. Interstate 610, colloquially known as The Loop, Loop 610, The 610 Loop, or just 610, traditionally marks the border between the inner city of Houston ("inside the Loop") and its surrounding areas. It is the inner of the two Houston beltways, the other being Beltway 8 (Sam Houston Tollway). Interstate 610 also runs through the city of Bellaire.