| Oak Hill Ridge Press |
| Oatmeal Investments |
| Ocean Tree Books |
| Off Road Publications |
| Ohio University Press |
| Old Waterfront Publishing |
| Old West Shop |
| On The Spot Books |
| Open Space Publications |
| Otowi Crossing Press |
| Our Natural Heritage Pub |
| Ouray County Historical Soc |
| OutdoorGuru.com |
| Oxford University Press |
| Pablo Balentine |
| Packrat Publishing |
| Paddle Publishing |
| Painted Hill Publishing |
| Paladin Press |
| Parachuting Publishing |
| Paragon Press |
| Pathfinder Equine Publications |
| PBG |
| Peanut Butter Publishing |
| Pearson Education Group |
| PeasePod Books |
| Pen & Fork Communications |
| Penfield Books |
| Penguin |
| Penny Lane Press |
| People's Press |
| Perigo Press |
| Perseus Distribution |
| Phyllis Senatore Newton |
| Piedra Azul Press |
| Pink Houses Publishing |
| Pioneer Press Inc |
| PixyJack Press |
| Playing Cards Plus |
| Pleasant Avenue Nursery |
| Pocket Guides Publishing, Inc |
| Pomegranate Communications |
| Portfolio Publications |
| Potential Press |
| Preserve the Rocks Fund |
| Pride Publications |
| Primer Publishing |
| Pronghorn Press |
| Provecho Press |
| Pruett Publishing Co. |
| PTO Press |
| Puma Press |
| Puzzled, Inc |
| Puzzlers Guides |