| Rank | Abbreviation | Meaning |
|---|
| ***** | HDCC | House Democratic Campaign Committee
| |
| ***** | HDCC | Harley Davidson Club Copenhagen
| |
| ***** | HDCC | Hawaiian Dredging Construction Company
| |
| ***** | HDCC | Higher Dimensions Christian Center
| |
| ***** | HDCC | Harley Davidson Club Catalunya
| |
| **** | HDCC | Half-Duplex Cooperative Channels
| |
| **** | HDCC | Hills District Car Club
| |
| **** | HDCC | Health Decisions Community Council
| |
| **** | HDCC | High Density Charge Cluster
| |
| **** | HDCC | Hull and District Canoe Club
| |
| **** | HDCC | Hertford and District Camera Club
| |
| **** | HDCC | Hazel Dell Christian Church
| |
| **** | HDCC | High Desert Christian College
| |
| *** | HDCC | High Dependability Computing Consortium
| |
| *** | HDCC | Harley-Davidson Credit Corp.
| |
| ** | HDCC | Hazel Dell Coal Corporation
| |
| ** | HDCC | Heinz Damberger Coal Cleaning
| |
| ** | HDCC | Hope Destitute Children's Centre
| |
| ** | HDCC | Herndon Dulles Chamber of Commerce
| |
| ** | HDCC | Hickory Dell Coal Company
| |
| ** | HDCC | Hazel Dell Coal Company
| |
| ** | HDCC | Horsham Downs Community Church
| |
| * | HDCC | Hambantota District Chamber of Commerce
| |