| Rank | Abbreviation | Meaning |
|---|
| ***** | MRHA | Missouri Rural Health Association
| |
| ***** | MRHA | Miramichi Regional Health Authority
| |
| **** | MRHA | Michigan Reining Horse Association
| |
| **** | MRHA | Maintenance of Religious Harmony Act
| |
| **** | MRHA | microtiter plate-reverse hybridization assay
| |
| **** | MRHA | D-mannose-resistant hemagglutinin
| |
| **** | MRHA | Montana Reining Horse Association
| |
| **** | MRHA | Montana Rural Health Association
| |
| *** | MRHA | Massachusetts Rental Housing Association, Inc.
| |
| *** | MRHA | Maryland Rural Health Association
| |
| *** | MRHA | Midland Railway Historical Association
| |
| *** | MRHA | D-mannose-resistant hemagglutinating activity
| |
| *** | MRHA | Michigan Rural Health Association
| |
| *** | MRHA | mannose-resistant haemagglutination
| |
| *** | MRHA | mannose resistant haemagglutinating activity
| |
| ** | MRHA | Minnesota Rural Health Association
| |
| ** | MRHA | Mississippi Regional Housing Authority
| |
| ** | MRHA | Montgomery Roller Hockey Association
| |
| ** | MRHA | Milwaukee Road Historical Association
| |
| ** | MRHA | Mexican Red-Headed Amazon
| |
| ** | MRHA | Michigan Retail Hardware Association
| |
| ** | MRHA | Mississauga Roller Hockey Association
| |
| * | MRHA | Mississippi Rural Health Association
| |
| * | MRHA | Maine Rural Health Association
| |
| * | MRHA | mannose-resistant haemagglutinin
| |