| Abbreviation | Definition |
|---|---|
| CMQ | Corporación Municipal de Quilpué |
| CMSD | Clarksdale Municipal School District |
| CMSM | Consolidated Municipal Service Manager |
| CMTW | Certified Municipal Treasurer of Wisconsin |
| CMU | Canton Municipal Utilities |
| CMVA | Câmara Municipal de Vargem Alta |
| CMVR | Câmara Municipal de Vila Real |
| CMWC | Canadian Municipal Water Consortium |
| CMWD | Calleguas Municipal Water District |
| CMWD | Carlsbad Municipal Water District |
| CMWD | Casitas Municipal Water District |
| CMYA | Civic Minded Young America |
| CNG | Civic Natural Gas |
| COIN | Civic Openness In Negotiations |
| COMMA | City of Morganton Municipal Auditorium |
| COP | Citizen Oversight Panel |
| COR | Civic Online Reasoning |
| CPAF | Civic Participation Action Fund |
| CPCI | Civic Partnership and Community Initiatives |
| CPCP | Center For Performance And Civic Practice |