| Gale Group |
| Gallopade International |
| Gardner Media |
| Gari M Stroh |
| Garland's Lodge |
| Gayle Baker |
| George Peknik |
| Get A Grip, Inc. |
| Ghost Road Press |
| Gibbs Smith Publisher |
| Glenn Brooks |
| Globe Pequot |
| Gold Dirt Press |
| Golden West Publishers |
| Good Books |
| Goodyear |
| Grand Canyon Association |
| Grand Valley Audubon Society |
| Grandview Publishing |
| Graphie International |
| Grasshopper Dream Productions |
| Great American Publishers |
| Great Plains Press |
| Greenwich Press |
| Gretchen DeSciose |
| Grolier Publishing Co. |
| Hachette Book Group USA |
| Hagstrom Map Company |
| Hancock House |
| Happy Horses of H Goodwine |
| Harcourt Brace |
| Harlan Barton |
| HarperCollins |
| Harris Farms Publishing |
| Havey Productions |
| Hay House |
| Health Communications, Inc. |
| Healthy Dining |
| Henry Pedersen |
| Hexagon Press |
| Heyday Books |
| HiClear Publishing, LLC |
| High Country Artworks LLC |
| High Plains Press |
| Highland Haven |
| High-Lonesome Books |
| Hippocrene Books |
| Hist Soc of Idaho Springs |
| Historic Denver |
| Historic Georgetown |
| History Cooks |
| Holloway House |
| Holly Annala |
| Holsten Books |
| Homestead Publishing |
| Horton Family Maps |
| Houghton Mifflin Harcourt |
| Howard E. Greager |
| Hugh W. Evans |