There are several El Nortes. I'm not sure how they're all related, or if they are. The one I've been to, in Niles, had a carryout menu that also listed locations in Waukegan and Mundelein, but not the sites I've passed on State Street and Ridge Avenue. I think there's one in Highwood, too.
The Niles one served me some perfectly nice tacos: carnitas, al pastor and chorizo. (They have a wider variety, including lengua, tongue; sesos, brains; and tipitas, tripe; but I wasn't in the mood.) Very good jamaica tea, as well. Besides tacos and burritos, etc., they offer complete dinners such as carne asada and chiles rellenos.
The place is pretty institutional-looking inside and the service, by teen-age girls, was only adequate -- though it is table service rather than the counter service I expected. However, the tacos were just fine.
Tacos el Norte
9626 N. Milwaukee Ave., Niles
847/635-5282