Elgin, Illinois is located northwest of Chicago in the suburbs of Cook County. At a population just under 100,000 it makes Elgin the 8th largest city in Illinois. Elgin has an area of 25 square miles. It is located in suburban Chicago. In the suburbs there are a whole host of pests that can find their way onto your property. If you see anything out of the ordinary don't wait for the infestation to settle in, you can minimize repair costs and damage to your property if you act quickly.