| Mead Lumber | WY +1 | | 1 | 2 |
| Meadow Lake Golf Course | MO | | 1 | |
| Medford School District, OR | OR | Government | 1 | |
| MEI Industrial Solutions | NV | Private | 1 | |
| Memphis Light GAS AND Water | TN | | 1 | |
| Mercer County Board Of Education, WV | WV | Government | 1 | |
| Mercer County Sheriff's Department, WV | WV | Government | 1 | |
| Meriden, CT | CT | | 1 | |
| Meridian Technology Center | OK | | 1 | |
| Meriwether Lewis Electric Cooperative, TN | TN | Government | 1 | 1 |
| Merkle Lawn Care INC | KY | Private | 1 | |
| Merrimac Municipal Light Dept | MA | Government | 1 | |
| Metcalfe County Board Of Education, KY | KY | Government | 1 | |
| Metro Ambulance - Government Remarketing, NJ | NJ | | 1 | |
| Metro-North Railroad, NY | NY | Government | 1 | |
| Metropolitan Transit Authority Harris County | TX | Government | 1 | |
| Metrotek-easton | PA | | 1 | |
| MG Tree | PA | | 1 | |
| Mid-East Career & Technology Centers, OH | OH | Government | 1 | |
| Midd-West School District | PA | Government | 1 | 1 |
| Middle Rio Grande Conservancy District | NM | Government | 1 | |
| Midland Mechanical Automation, LLC | MO | Private | 1 | |
| MIG Corporation INC | MA | Private | 1 | |
| Mike Makela | FL | Private | 1 | |
| Mike's Diesel Repair | MN | Private | 1 | |
| Milford Township | PA | Government | 1 | |
| MillTech | TX | | 1 | |
| Milltown Borough, NJ | NJ | Government | 1 | |
| Minnesota Power | WI | | 1 | |
| Mission Ready Services, SC | SC | Private | 1 | |
| Mississippi State University, MS | MS | Government | 1 | |
| Missouri Department Of Transportation (modot) | MO | Government | 1 | |
| Missouri State Highway Patrol | MO | Government | 1 | |
| Mitchell Community College, NC | NC | Government | 1 | |
| Mitchell Trucking & Excavating | IN | Private | 1 | |
| MJ Elec-acs | WI | | 1 | |
| Modek Logistics | KY | Private | 1 | |
| Mohamad Hammad | FL | Private | 1 | |
| Monroe County Road District 6 | IL | Government | 1 | |
| Monroe County Road District 9 | IL | Government | 1 | |
| Monroe County Sheriff's Office, GA | GA | Government | 1 | |
| Monroe County, TN | TN | Government | 1 | 2 |
| Monroe, CT | CT | | 1 | 1 |
| Monroe, NC | NC | | 1 | |
| Monroe, OH | OH | | 1 | |
| Monroe Township, NJ | NJ | Government | 1 | |
| Montachusett Regional Transit Authority | MA | Government | 1 | |
| Monterey Peninsula Water Management District | CA | Government | 1 | |
| Montgomery County, MO | MO | Government | 1 | |
| Montgomery County, PA | PA | Government | 1 | |
| Montgomery Trucking | SC | Private | 1 | |
| Moore Public Schools | OK | Government | 1 | |
| Moose Roofing | NE | Private | 1 | |
| Morgan City, LA | LA | Government | 1 | |
| Morgan County Board Of Commissioners, GA | GA | Government | 1 | 1 |
| Morgantown Utility Board, WV | WV | Government | 1 | |
| Morris School District, NJ | NJ | Government | 1 | |
| Morris-Turnberry, ON | | | 1 | |
| Mouhssine Moumen | FL | Private | 1 | |
| Mount Gilead Exempted Village School District, OH | OH | Government | 1 | |