| macaroni | machine shop | machine tool accessories |
| magazine distributors | mail-order houses | maker industrial |
| malt beverages | management consulting services | management investment |
| manifold business forms | man made | manufactured ice |
| manufacturers agents | manufacturers representatives | manufacturing industries |
| marble | marble products manufacturers | marble products natural |
| marina | marine contractors | marine designers |
| marine insurance | marking devices | martial arts schools |
| masonry contractors | massage school | meat market |
| meat packing plants | meat products | meats |
| meat wholesale | mechanical pencils | medical clinic |
| medical dental assistant technician schools | medical doctors | medical equipment rental |
| medical instruments | medical laboratories | medical school |
| medical service plans | medicinal | medicinal chemistry |
| medicinal products manufacturers | membership organizations | membership sports |
| men's clothing retail | men's footwear | men's trousers |
| men clothing | men coats | mens clothing stores |
| men slacks | men suits | mental health clinics |
| merchandising machine operators | metal cans | metal coating |
| metal cutting type | metal doors | metal finishing |
| metal goods | metal goods manufacturers | metal heat treating |
| metal polishing | metal sanitary ware | metal service centers |
| metals service offices | metal stamping | metal stamping manufacturers |
| metal working machinery | mexican restaurant | middle school |
| millwork | millwork contractors | millwork manufacturers |
| mineral conservation | mini bike dealers | mini bikes |
| mining machinery | miscellaneous accessory stores | miscellaneous apparel stores |
| miscellaneous business credit institutions | miscellaneous commercial sectors | miscellaneous fabricated wire products |
| miscellaneous food stores | miscellaneous general merchandise stores | miscellaneous homefurnishings |
| miscellaneous nonmetallic minerals | miscellaneous personal service | miscellaneous publishing |
| miscellaneous retail stores | misses' dresses | misses' outerwear |
| misses' suits | mobile home community | mobile home parks |
| mobile homes | molded rubber goods | molded rubber goods manufacturer |
| molder | monetary policy | montessori school |
| mortgage banker | mossaic work | motel |
| motion picture distribution services | motion picture equipment | motion picture film distributions |
| motion picture film exchanges | motion pictures | motion picture supplies |
| motion picture theaters | motorcycle | motorcycle dealers |
| motor home | motor scooter dealers | motor scooters |
| motor vehicle | motor vehicle accessories | motor vehicle new parts |
| motor vehicle parts | motor vehicle supplies | movie theaters |
| moving supplies | moving supplies renting | muffins |
| mufflers engine | museum | musical instruments |
| musical instrument stores | music school |
