| Name | Phone | Category |
| LA BARRA RISTORANTE | (630) 861-6177 | Restaurants |
| LACEY CREEK SUPPORTIVE LIVING | (630) 964-7720 | Retirement Community |
| LANG'S AUTO SERVICE, INC. | (630) 968-4626 | Automobile Repairs and Maintenance |
| LAVELLE LAW, LTD | (847) 705-7555 | Legal |
| LAWRENCE KAMIN, LLC | (312) 372-1947 | Attorneys - Business |
| LEFFELMAN MEAT CENTER | 630-442-0229 | Butcher Shop |
| LESLIE HEATING AND COOLING, INC. | (630) 985-9800 | |
| LIFESTANCE HEALTH | (630) 428-7890 | Counseling Services |
| LITTLE FRIENDS, INC. - COLORBURST | (630) 852-7520 | Promotional Products |
| LITTLE FRIENDS, INC. - SPECTRUM VOCATIONAL SERVICES | (630) 852-7520 | Packaging & Shipping |
| Cindy Littlefield | (708) 407-2367 | |
| LOAVES & FISHES COMMUNITY SERVICES | (630) 355-3663 | Food Pantry |
| LODAAT | (630) 248-2380 | |
| LOS ARCOS MEXICAN GRILL & BAR | (630) 434-9877 | Restaurants |
| LOUIS FOR MEN | (630) 968-6333 | Men's Clothing |
| LOVE CHRISTIAN CLEARINGHOUSE | (630) 512-8665 | Non-Profit Organizations |
| LUCKY LINCOLN GAMING LLC | (708) 638-8237 | Gaming |
| LYONS LAW GROUP, LLC | (630) 852-2529 | Attorneys - Business |
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