| Rank | Abbreviation | Meaning |
|---|
| ***** | SGDC | Signs of Grace Deaf Church
| |
| ***** | SGDC | Society of Graphic Designers of Canada
| |
| **** | SGDC | Swiss German Dixie Corporation
| |
| **** | SGDC | Sebaceous-Gland-Derived Cells
| |
| **** | SGDC | Sunnet Graphic Design Company
| |
| **** | SGDC | Stump Grinder Dirt Club
| |
| *** | SGDC | Solid Gold Dance Connection
| |
| *** | SGDC | Spy Guys Discount Catalog
| |
| *** | SGDC | Shale Gas Drilling & Completions
| |
| *** | SGDC | Sabah Geographic Data Coordination
| |
| *** | SGDC | Student Government in Dumaguete City
| |
| *** | SGDC | Speke Garston Development Company
| |
| *** | SGDC | Spy Guys Discount Catalogue
| |
| ** | SGDC | Starter Games Dog of Canada
| |
| ** | SGDC | Stormwater Grading and Drainage Control
| |
| ** | SGDC | Scripps Geological Data Center
| |
| ** | SGDC | Stephen Godfrey Dental Care
| |