| Rank | Abbreviation | Meaning |
|---|
| ***** | MCBL | Maryland Collegiate Baseball League
| |
| **** | MCBL | Microbiology and Cell Biology
| |
| **** | MCBL | McHenry County Baseball League
| |
| **** | MCBL | Morgan City Branch Library (Morgan City, LA)
| |
| **** | MCBL | May Coddington Branch Library (San Bernardino, CA)
| |
| *** | MCBL | Marine City Branch Library (Marine City, MI)
| |
| *** | MCBL | Molecular and Cell Biology Laboratory
| |
| *** | MCBL | Marathon City Branch Library (Marathon, WI)
| |
| *** | MCBL | Molecular and Cell Biology of Lipids
| |
| *** | MCBL | Mauritius Commercial Bank Ltd
| |
| ** | MCBL | Mountain Collegiate Baseball League
| |
| ** | MCBL | Malawi Campaign to Ban Landmines
| |
| ** | MCBL | Midwest City Branch Library (Midwest City, OK)
| |
| ** | MCBL | Milwaukee Campaign to Ban Landmines
| |
| ** | MCBL | Madison County Branch Library (Huntsville, AR)
| |
| ** | MCBL | Mission Command Battle Lab
| |
| * | MCBL | Middleburg Cmty Branch Library (Middleburg, PA)
| |
| * | MCBL | Macks Creek Branch Library (Macks Creek, MO)
| |
| * | MCBL | Marin City Branch Library (Sausalito, CA)
| |
| * | MCBL | Marion County Branch Library (Buena Vista, GA)
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| * | MCBL | Myrtle Creek Branch Library (Myrtle Creek, OR)
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| * | MCBL | Miller County Branch Library (Colquitt, GA)
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| * | MCBL | McClure Cmty Branch Library (McClure, PA)
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| * | MCBL | MC CRELESS BRANCH LIBRARY (San Antonio, TX)
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| * | MCBL | McClure Community Branch Library (McClure, OH)
| |