| Northern Tree Service INC | MA | Private | 1 | |
| NorthStar Energy Services Inc. | TX | Private | 1 | |
| Northtex Construction | TX | Private | 1 | |
| Northwest Fire District | AZ | Government | 1 | |
| Northwestern Water And Sewer District, OH | OH | Government | 1 | |
| Norton, MA | MA | | 1 | |
| Norwood, OH | OH | | 1 | |
| Nupt Inc, ON | | Private | 1 | |
| Nyack Joint Fire District-NY | NY | Government | 1 | |
| O'Bannon Banking Company | MO | Private | 1 | |
| O'Brien Ready Mix, Inc. | KS | Private | 1 | |
| O'Connell Electric Inc | NY | Private | 1 | |
| Oak Lawn Village, IL | IL | Government | 1 | |
| Oakland Borough | NJ | Government | 1 | |
| Ochiltree County, TX | TX | Government | 1 | |
| Ohio Department Of Transportation, OH | OH | Government | 1 | 1 |
| Ohio Turnpike And Infrastructure Commission | OH | | 1 | |
| Okemos Moving Brothers | MI | | 1 | |
| Olympic Trailer & Truck | WA | Private | 1 | |
| Oneonta, AL | AL | | 1 | |
| Onondaga County Water Authority | NY | Government | 1 | |
| Orange AND Rockland Utilities INC | PA | Private | 1 | |
| Orange County Mosquito And Vector Control District, CA | CA | Government | 1 | |
| Orange County, Texas (Orange) | TX | Government | 1 | |
| Oregon City School District | OR | Government | 1 | |
| Orem City | UT | Government | 1 | |
| Osborn, MO | MO | | 1 | |
| Osceola County Sheriff | FL | Government | 1 | |
| OSU Animal & Food Sciences | OK | Government | 1 | |
| OSU Frsu - Research Station - Stillwater, OK | OK | Government | 1 | |
| Ottumwa Community School District, IA | IA | Government | 1 | |
| Outwest Network Inc | OK | Private | 1 | |
| Owensboro Municipal Utilities | KY | Government | 1 | |
| Oxford Crane, Inc. | IL | Private | 1 | |
| P&P | TX | | 1 | |
| P&W Equipment, LLC | TX | Private | 1 | |
| Palletized Trucking | TX | | 1 | 3 |
| Palmer Truck & Trailer Repair | KS | Private | 1 | |
| Palo Verde Unified School District | CA | Government | 1 | |
| Pamplico Rescue, SC | SC | | 1 | |
| PAR Electric / Altec Capital Svcs | MO | Private | 1 | |
| Park County, CO | CO | Government | 1 | |
| Payless Prop INC | IA | Private | 1 | |
| Peace River Electrical Coop | FL | | 1 | |
| Peeps | KS | | 1 | |
| Pelham City Schools Board Of Education, GA | GA | Government | 1 | |
| Pell City, AL | AL | Government | 1 | |
| Pence Group | MO | | 1 | |
| Pendergast Elementary School District #92 | AZ | Government | 1 | |
| Pendergrass Police Department, GA | GA | Government | 1 | |
| Pennsylvania Turnpike Commission, PA | PA | Government | 1 | |
| Pepper Pike, OH | OH | | 1 | |
| Pequannock Township, NJ | NJ | Government | 1 | 1 |
| Pequea Township | PA | Government | 1 | |
| Perry County Recycling Center | MO | Government | 1 | |
| Perth, ON | | | 1 | |
| Peters Township | PA | Government | 1 | |
| Philomath, OR | OR | | 1 | |
| Phinia | IA | | 1 | |
| Piedmont Pipe Construction INC | NC | Private | 1 | |