http://www.uscis.gov/graphics/formsfee/forms/i-485.htm
You will need to mail your application to:
U.S. Citizenship and Immigration Services
P.O. Box 805887
Chicago, IL 60680-4120
Or, for non-United States Postal Service (USPS) deliveries (e.g. private couriers)
U.S. Citizenship and Immigration Services
Attn: FBASI
427 S. LaSalle – 3rd Floor
Chicago, IL 60605-1098
5. You should sent everything together to the same address. That what I did when I ted my application last year. USCIS will send you recipt notice after they receive your package.
If you are not sure, use Infopass to ask your local INS officer. That's the safest way.
Good Luck:)