| Rank | Abbreviation | Meaning |
|---|
| ***** | HCAD | Hypoplastic Coronary Artery Disease
| |
| *** | HCAD | Harris County Appraisal District
| |
| ** | HCAD | Harrison Central Appraisal District
| |
| ** | HCAD | Hays County Appraisal District
| |
| * | HCAD | Harrison County Appraisal District
| |
| * | HCAD | Harris County Appriasal District
| |
| * | HCAD | Human Chromosome Aberration Database
| |
| * | HCAD | Hereford College of Art and Design
| |
| * | HCAD | Howard County Association of the Deaf
| |
| * | HCAD | Hansford County Appraisal District
| |
| * | HCAD | Health Care Advance Directive
| |
| * | HCAD | Health Care Administrator
| |
| * | HCAD | Health Care Administration Department
| |
| * | HCAD | human caspase activated DNase
| |
| * | HCAD | Head of Contracting Activity Designee
| |
| * | HCAD | Hamilton County Appraisal District
| |
| * | HCAD | Harry Connick Alexander Du
| |
| * | HCAD | Harris County Appraisal District's
| |
| * | HCAD | HSBC ETFS Plc (London Stock Exchange [LSE])
| |
| * | HCAD | Honolulu Culture and Arts District
| |
| * | HCAD | Health Care Advanced Directive
| |
| * | HCAD | Hill County Appraisal District
| |
| * | HCAD | Home Care Activity Desk
| |
| * | HCAD | Hale County Appraisal District
| |
| * | HCAD | Henderson County Appraisal District
| |