Welcome to Princeton Princeton is an active city located two hours west of Chicago on Interstate 80. We have much to offer with many activities and seasonal festivals. Our two downtown retail districts offer a step back in time with a variety of specialty shops and businesses. Business can benefit by operating in Princeton thanks to an array of economic development incentives. If you have any questions about Princeton area events or activities, contact the Princeton Chamber of Commerce at (815) 875-2616 or online.