| Staff | Title | Departments | Phone | Email |
|---|
| Munoz, Armando | Deputy | Constable Precinct 1 | | |
| Muniz, Mandy | Deputy | Constable Precinct 1 | | |
| Munguia, Diana | Elections Manager | County Clerk | (361) 888-0580 | |
| Mumphord, Valerie | Administrative Secretary | Constable Precinct 1 | | |
| Motor Vehicle | Main Line | Tax Assessor/Collector | (361) 888-0459 | |
| Morrison, Sue | A/P Accounting Assistant | County Auditor | (361) 888-0614 | |
| Moreno, Yolanda | Senior Accounting Assistant | Public Works | (361) 888-0490 | Email |
| Moreno, Lesley | Legal Secretary | Public Defender | | Email |
| Moreno, Ernest | Corporal | Constable Precinct 1 | | |
| Morales, Yvon | Cite and Release Coordinator | District Attorney | (361) 888-0271 | Email |
| Morales, Patricia C. | Court Reporter | County Court at Law 1 | (361) 888-0252 | Email |
| Morales, Connie | Court Manager | JP 2-2 | (361) 937-2614 | |
| Moore, Sophie | Prosecutor | 28th District Court | (361) 888-0410 | Email |
| Molina, Melinda | Court Clerk | 319th District Court | (361) 888-0642 | |
| Mihoin, Linda | Benefit Accountant | Human Resources | (361) 888-0208 | Email |
| Mihoin, Adrea | Benefits Coordinator | Human Resources | (361) 888-0464 | Email |
| MetroCom | | Sheriff | (361) 826-2900 | |
| Mendoza, Oscar | Constable | Constable Precinct 5 | (361) 767-5204 | |
| Medary, Missy | Judge | 347th District Court | | |
| McLemore, Theresa C. | Budget Assistant | County Judge | (361) 888-0853 | Email |