| Staff | Title | Departments | Phone | Email |
|---|
| Main Line - Elections | | County Clerk | (361) 888-0580 | |
| Marez, John | County Commissioner Precinct 3 | Commissioner Precinct 3 | | Email |
| Martinez, Blanche | | District Clerk | (361) 888-0573 | Email |
| Martinez, Marisa | Court Reporter | County Court at Law 3 | (361) 888-0625 | Email |
| Martinez, Rick | Bailiff | 148th District Court | (361) 888-0739 | |
| Martinez, Velma | Chief Deputy | Tax Assessor/Collector | (361) 888-0204 | |
| McCahan, Jason | Constable | Constable Precinct 2 | (361) 937-6306 | |
| McCauley, Michael | Judge | 28th District Court | | |
| McClure, C. | Deputy | Sheriff | (361) 887-2248 | |
| McClure, Christina | Lieutenant | Constable Precinct 2 | | |
| McCoy, Timothy J. | Judge | County Court at Law 5 | | |
| McLemore, Theresa C. | Budget Assistant | County Judge | (361) 888-0853 | Email |
| Medary, Missy | Judge | 347th District Court | | |
| Medical Examiner - Deputy | Dr. Diane-Ngan H. Trang | Medical Examiner | (361) 884-4994 | |
| Mendoza, Oscar | Constable | Constable Precinct 5 | (361) 767-5204 | |
| MetroCom | | Sheriff | (361) 826-2900 | |
| Molina, Melinda | Court Clerk | 319th District Court | (361) 888-0642 | |
| Moore, Sophie | Prosecutor | 28th District Court | (361) 888-0410 | Email |
| Morales, Patricia C. | Court Reporter | County Court at Law 1 | (361) 888-0252 | Email |
| Morales, Yvon | Cite and Release Coordinator | District Attorney | (361) 888-0271 | Email |