| machine shop | magnesium foundries | management consulting services |
| manufacturers agents | manufacturers representatives | marble |
| marina | masonry contractors | massage school |
| meats | meat wholesale | medical clinic |
| medical doctors | medical laboratories | membership organizations |
| membership sports | men's clothing retail | men clothing |
| mental health clinics | metal finishing | metal polishing |
| metal stamping | mexican restaurant | middle school |
| mini bike dealers | mini bikes | miscellaneous accessory stores |
| miscellaneous apparel stores | miscellaneous personal service | miscellaneous publishing |
| miscellaneous retail stores | mobile home dealers | mobile home parks |
| mobile homes | molder | montessori school |
| mortgage banker | motel | motion pictures |
| motorcycle | motorcycle dealers | motor home |
| motor scooters | motor vehicle | movie theaters |
| moving supplies | muffins | museum |
| musical instruments | music school |
