- Hershey's2
- Historic Charleston Foundation4,227
- Historic Columbia, S.C. Foundation3
- Home Economics Institute;Westinghouse Electric & Manufacturing Co.1
- Horry Georgetown Technical College1
- Horry-Georgetown Technical College (Conway, S.C.)10
- Huguenot Society of South Carolina36
- Hulman and Company1
- I. J. Grass Noodle Company1
- Igleheart Brothers1
- Igleheart Brothers, Inc.1
- Igleheart Brothers, Incorporated, Evansville, Indiana1
- Interstate Cotton Oil Refining Co.1
- Iowa Dairy Industry Commission1
- J. P. Dieter Company, Chicago, Illinois1
- Jacques Mfg. Co., Chicago, Illinois1
- Jean Lafitte National Historical Park and Preserve3
- Jell-O5
- Joan of Arc1
- John Behrmann Inc1