The Loop is the city’s business district located in downtown Chicago. A common belief is that the Loop received its name from the cable cars that made loops through the area in the late 1800s. Others say it was after the creation of the elevated railroad system that travels in loops throughout the area. The Loop is filled with many cultural, historical, and educational institutions. Its boundaries are the Chicago River (N), Roosevelt Road (S), Lake Michigan (E), and the Chicago River (W). Zip Code(s) 60601, 60602, 60603, 60604, 60605 60606, 60607, & 60661.