Size:	57,918 square miles, 213 miles East to West and 379 miles North to South
People:	209 people per square mile
Economy:	Booming.

City and region specific factors

All legal private investigator activities are available in Illinois including surveillance, background research, statements, photos, due diligence, undercover and process serving. Several professionals with strong backgrounds and good records have agencies in Chicago and its suberbs.

Chicago area has several professional and experienced investigators. Much of the state is agricultural. Sparsely populated areas can be serviced by investigators from nearby cities. Private investigators are required to have a license to work in Illinois. Investigations can be carried out in places such as: Addison, Alton, Arlington Heights, Aurora, Bellwood, Bensenville, Berwyn, Bloomfield, Bloomington, Buffalo Grove, Carbondale, Burbank, Dolton, Downers Grove, Decatur, Danville, Carpentersville, Evanston, Freeport, Galesburg, Granite City, Hanover, Herrin, Highland Park, Hoffman, Hoffman Estates, Markham, Libertyville, Loon Lake, Kingston, Joliet, Kankakee, La Grange, Lawrenceville, Moline, Morris, Mt. Prospect, Mundelein, Niantic, Peoria, Pekin, Park Ridge, Palatine, Niles, Providence, Quincy, Schaumburg, Roselle, Skokie, Sparta, Sterling, Swansea, Streamwood, Terre Haute, Tioga, Union Hill, Unionville, Urbana, Vernon Hills, Virden, Wacker, Waukegan, Wheaton, Wheeling, Zion, Woodridge, Wilmette and Westcheter.