| Rank | Abbreviation | Meaning |
|---|
| ***** | MCOG | Marine Consultants and Officials Group
| |
| ***** | MCOG | Muon Collider Oversight Group
| |
| **** | MCOG | Major Clusters of Orthologous Genes
| |
| **** | MCOG | Mendocino Council of Governments
| |
| **** | MCOG | Miracle Church of God in Christ
| |
| *** | MCOG | Muon Collaboration Oversight Group
| |
| *** | MCOG | Medical College of Georgia
| |
| *** | MCOG | Maritime Certified Organic Growers
| |
| *** | MCOG | Midcoast Council of Governments
| |
| *** | MCOG | Mysterious Cities of Gold
| |
| ** | MCOG | Merrymeeting Council of Governments
| |
| ** | MCOG | Middlebury College Organic Garden
| |
| ** | MCOG | Mendenhall Church of God
| |
| ** | MCOG | Mobile Crane Operators Group
| |
| ** | MCOG | Massively Casual Online Game
| |
| ** | MCOG | Montebello Citizens for Open Government
| |
| * | MCOG | Mystical City of God
| |
| * | MCOG | Mayors' Council of Guam
| |
| * | MCOG | Mattawamkeag Church of God
| |
| * | MCOG | Murray Chevrolet Oldsmobile Geo
| |
| * | MCOG | Merrill Creek Owners Group
| |
| * | MCOG | Mendocino County of Governments
| |
| * | MCOG | Moeco Cambodia Oil & Gas
| |
| * | MCOG | Messianic Church of God
| |
| * | MCOG | Marbury Church of God
| |