* Businesses in Bold are Chamber Members
| Company | Address | Phone Number |
| M&P Child Care LLC | 114 Vista Place | 608-375-5437 |
| Marcia's Crafty Sewing | 41826 Cty Rd W | 608-872-2374 |
| Mary's Day Care / Mary Fitzgerald | 117 Circle Drive. | 608-375-5524 |
| McLean, Daniel J., CPA | 905 Wisconsin Avenue | 608-375-5482 |
| McNamee Law Office | 1001 Wisconsin Avenue | 608-375-2828 |
| Mediacom Cablevision | ||
| Mere Images | 2750 Spring Valley Road | 608-375-5600 |
| Michael Mecikalski, DDS | 310 Parker Street | 608-375-4640 |
| Midwest Silo Co. * | 505 E. Prairie Street | 608-375-4250 |
| Mike Reynolds Engineering * | 307 East Oak Street | 608-375-2471 |
| Miller Pad & Paper * | 1507 Elm St. | 608-375-2181 |
| Misty Spray Car Wash * | 311 Warah Street | 608-843-7509 |
| Mr. Tom's Body & Paint * | 305 W. LeGrand Street | 608-375-4480 |
| MSC - Milk Specialties * | Route 2 | 608-375-4187 |
| Mt. Trumm Trailers | Circle Drive | 608-485-0901 |
| My PC, LLC | 104 Southview Rd. | 608-531-1741 |
* Businesses in Bold are Chamber Members