There are many minor airports near the city besides the major ones. Some of these airports have limited commercial services and the rest of them have many future development plans. These include:

'Chicago Rockford International Airport'

'Meigs Field'

The 'Gary Chicago International Airport' also belongs to this category with no present commercial services from the place. However, they all have plans for future development and are working hard for attracting more customers and airlines. Soon, they are going to attract more airlines and thereby passengers would have more options for travelling from and to Chicago.

http://www.flyrfd.com/

http://www.thetracon.com/airports.html

1. US Post Office Cardiss Collins, 433 W Harrison St, Chicago, IL 60607

2. U. S. Post Office - Jefferson Park, 5401 W Lawrence Avenue, Chicago, IL 60630

3. U. S. Post Office - Loop at Aon Centre, 200 E, Randolph St, Chicago, IL 60601

4. US Post Office - Englewood, 611 W, 63rd St, Chicago, IL 60621

5. United States Post Office, 5424 W Devon Avenue, Chicago, IL 60646

6. United States Post Office, 2011 W Montrose Ave, Chicago, IL 60686

7. US Post Office, 3319 N Cicero Avenue, Chicago, IL 60641

8. US Post Office, 6300 N Northwest Hwy, Chicago, IL 60631

9. United States Post Office, 956 E 58th St, Chicago, IL 60615

10. United States Postal Service, 1343 W Irving Park Rd, Chicago, IL 60613

For more details, click:

http://www.yelp.com/search?find_loc=Chicago%2C+IL&cflt=postoffices

http://www.topix.com/yp/chicago/c/government-post-offices