OSOI covers most of the zip codes in Chicago and suburbs (Naperville, Schaumburg, and Buffalo Grove, etc). We are also in California, please check delivery availability for your Zip Code while you proceed shopping with us. Some of the top locations we are serving other than Chicago: California, Santa Clara, Los Gatos, Dublin, Los Altos, Campbell, Pleasanton, San Jose, Fremont, Livermore, Stanford, Cupertino, Palo Alto, Sunnyvale, San Ramon, and Pittsburgh.