| Genzyme | Cambridge | 1981 |
| GeoEye | Herndon | 1992 |
| Georgia-Pacific | Atlanta, Georgia-Pacific Tower | 1927 |
| Gerber Legendary Blades | Tigard | 1939 |
| Gerber Products Company | Fremont | 1927 |
| Getty Oil | East Meadow | 1964 |
| Giant Sparrow | Santa Monica | March 22, 2009 |
| Gibson Brands | Tennessee, Nashville | 1902 |
| Global Payments | Atlanta | 2000 |
| GlobalFoundries | Malta | October 7, 2008 |
| GMT Games | Hanford | 1990 |
| Golden Boy Promotions | Los Angeles | 2002 |
| Goodyear Tire and Rubber Company | Akron | August 29, 1898 |
| Google Nest | Palo Alto | 2010 |
| Graflex | Rochester | 1889 |
| Graham Holdings Company | Washington, D.C. | 1889 |
| Greyhound Lines | One Dallas Center | 1914 |
| Groupon | Chicago | 2008 |
| Grubhub | Chicago | 2004 |
| GTE | Stamford | 1918 |
| Guardian Industries | Auburn Hills | 1932 |
| Guild Guitar Company | Oxnard | 1952 |
| Hallmark Cards | Kansas City | 1907 |
| Handspring | Mountain View | June 1998 |
| Hanesbrands | Winston-Salem | January 1, 2000 |
| Hanna-Barbera | Los Angeles, Sherman Oaks Galleria | 1957 |
| Hardee's | St. Louis | September 9, 1960 |
| Harman International Industries | Stamford | 1980 |
| Harman Kardon | Stamford | 1953 |
| Hasbro | Pawtucket | 1923 |
| HEAD | Kennelbach | 1950 |
| Hennessey Performance Engineering | Houston | 1992 |
| Henry Ford Company | Detroit | 1901 |
| Hercules Inc. | Wilmington | 1912 |
| Heroku | San Francisco, California | 2007 |
| HGST | San Jose | 2003 |
| Hill & Knowlton | New York City | 1927 |
| Hiller Aircraft Company | Firebaugh | 1942 |
| Holiday Inn Express | — | 1991 |
| Holland America Line | Seattle | 1873 |
| Honeywell | Charlotte | April 23, 1885 |
| Hormel | Austin | 1891 |
| House of Blues | Los Angeles | November 26, 1992 |
| HRG Group | Rochester | 1953 |
| Hulu | Santa Monica | March 2007 |
| Hurley International | Costa Mesa | 1998 |
| Hy-Vee | West Des Moines | 1930 |
| IBM Cloud Video | San Francisco | 2007 |