There are exits to First Avenue from the Eisenhower Expressway (I-290) and from the Stevenson Expressway (I-55). Signs on First Avenue will direct you to the zoo's main entrance and zoo parking - or you can just follow the lion's roar.
Parking for 2011 is $9.00 per car.
Call the Brookfield Zoo Guest line at (708) 688-8000 for more information. If you're calling from outside Chicago or from the suburbs dial (866) GoToZoo OR (800) 201-0784.