| Rank | Abbreviation | Meaning |
|---|
| ***** | HCPA | Hampden County Physician Association
| |
| ***** | HCPA | Hawaiian Cultural Preservation Association
| |
| ***** | HCPA | Health Care Purchasing Alliance
| |
| ***** | HCPA | Handicapped Children's Parents Association
| |
| ***** | HCPA | Haemophilia Chartered Physiotherapists Association
| |
| **** | HCPA | Hospital de Clinicas de Porto Alegre
| |
| **** | HCPA | Homomorphic Cluster Coherent Potential Approximation
| |
| **** | HCPA | Health Care Protection Act
| |
| **** | HCPA | Hillsborough County Property Appraiser
| |
| **** | HCPA | Health Care Power of Attorney
| |
| *** | HCPA | Hellenic Crop Protection Association
| |
| *** | HCPA | Hamilton County Police Association
| |
| *** | HCPA | Hobby Center for the Performing Arts
| |
| *** | HCPA | Habitat Conservation Plan Association
| |
| ** | HCPA | Handicapped Children's Protection Act
| |
| ** | HCPA | Hoofd Centrale Post Ambulancevervoer
| |
| ** | HCPA | Hampden County Physicians Associates
| |
| ** | HCPA | Houston Climate Protection Alliance
| |
| * | HCPA | Houston Citizens' Police Academy
| |
| * | HCPA | Health Care Practice Area
| |
| * | HCPA | Houston Collegiate Panhellenic Association
| |
| * | HCPA | Historic Catasauqua Preservation Association
| |
| * | HCPA | Hate Crime Prevention Act
| |
| * | HCPA | Hmong College Prep Academy
| |
| * | HCPA | Houston Corporate Paralegal Association
| |