The Thomas Landscaping Company services the following communities in Illinois:

Cook County:

Arlington Heights, Barrington , Barrington Hills, Barrington Woods, Bartlett, Bedford Park, Bellwood, Blue Island, Bridgeview, Broadview, Brookfield, Buffalo Grove, Calumet City, Chicago, Chicago Heights, Chicago Ridge , Cicero, County Club Hills, Crestwood, Des Plaines, Elk Grove Village, Elmwood Park, Englewood, Evanston, Evergreen Park, Flossmoor, Forest Park, Franklin Park, Glencoe, Glenview, Hickory Hills, Hoffman Estates, Inverness, La Grange, Lansing, Lemont, Lincolnwood, Melrose Park, Morton Grove, Mount Prospect, Niles, Norridge, North Riverside, Northbrook, Northfield, Oak Forest, Oak Lawn, Oak Park, Orland Park, Palatine, Palos Heights, Palos Hills, Park Ridge, Prospect Heights, Riverdale, Riverside, Rolling Meadows, Rosemont, Schaumburg, Schiller Park, Skokie, South Barrington, Streamwood, Tinley Park, Westchester, Wheeling, Wilmette, Winnetka.

DuPage County:

Addison, Bensenville, Bloomingdale, Burr Ridge, Carol Stream, Clarendon Hills, Darien, Downers Grove, Elmhurst, Glen Ellyn, Glen Oak, Glendale Heights, Hanover Park, Hinsdale, Itasca, Lakewood, Lisle, Lombard, Medinah, Naperville, North Glen Ellyn, Oak brook, Oakbrook Terrace, Prince Crossing, Roselle, South Addison, Villa Park, Warrenville, Wayne, West Chicago, Westmont, Wheaton, Willowbrook, Winfield, Wood Dale, Woodridge, Yorkfield

Lake County:

Antioch, Aptakisic, Bannockburn, Beach Park, Beach Station, Briergate, Deer Park, Deerfield, Deerpath, Diamond Lake, Dunes Park, Forest Lake, Fox Lake, Fox Lake Hills, Fremont Center, Gages Lake, Glencoe, Grandwood Park, Grayslake, Green Oaks, Gurnee, Hainesville, Half Day, Hawthorn Woods, Hickory Corners, Highland Park, Highmore, Highwood, Horatio Gardens, Indian Creek, Ingleside, Island Lake, Ivanhoe, Killdeer, Kings Island, Knollwood, Lake Barrington, Lake Bluff, Lake Forest, Lake Villa, Lake Zurich, Libertyville, Lincolnshire, Lindenhurst, Long Grove, Long Lake, Lotus Woods, Mettawa, Millburn, Mundelein, North Barrington, North Chicago, Park City, Prairie View, Ravinia, Riverwoods, Round Lake, Round Lake Beach, Round Lake Heights, Third Lake, Tower Lake, Vernon Hills, Volo, Wadsworth, Wauconda, Waukegan, Wildwood, Winthrop Harbor, Woodridge, Zion

McHenry County:

Alden, Algonquin, Barreville, Belden, Bull Valley, Cary, Crystal Lake, Emerald Park, Fox River Grove, Franklinville, Greenwood, Hebron, Holiday Hills, Huntley, Johnsburg, Lake in the Hills, Lakemoor, Lakewood, Marengo, McCollum Lake, McHenry, McHenry Shores, Oakwood Hills, Port Barrington, Prairie Grove, Richmond, Ringwood, Silver Lake, Spring Grove, Union, Wonder Lake, Woodstock

Kane County:

Aurora, Batavia, Big Rock, Burlington, Campton Hills, Carpentersville, East Dundee, Elburn, Elgin, Geneva, Gilberts, Hampshire, Kaneville, Maple Park, Montgomery, North Aurora, St Charles, Sleepy Hallow, South Elgin, Sugar Grove, Virgil, West Dundee, Woodland Hills