Some cities covered by area code 224 are Algonquin, Arlington Heights, Buffalo Grove, Carpentersville, Des Plaines, Elk Grove Village, Evanston, Glenview, Gurnee, Highland Park, Hoffman Estates, Lake Forest, Lake in the Hills, Libertyville, Morton Grove, Mount Prospect, Mundelein, Niles, North Chicago, Northbrook, Palatine, Park Ridge, Rolling Meadows, Round Lake Beach, Schaumburg, Skokie, South Elgin, Vernon Hills, Waukegan, Wheeling, Wilmette, Zion