| Maurice J. McDonough High School | 7165 Marshall Corner Road
Pomfret, MD 20675 | | |
| Mattingly Park Ramp | Mattingly Ave
Indian Head, MD 20640 | (301) 743-5511 | |
| Matthew Henson Middle School | 3535 Livingston Road
Indian Head, MD 20640 | | |
| Mattawoman-Beantown Park & Ride (903) | Mattawoman-Beantown Road
Waldorf, MD 20602 | | |
| Mattawoman State Natural Environmental Area | Chicamuxen Road (Route 224)
Indian Head, MD 20640 | (301) 888-1410 | |
| Mattawoman Middle School | 10145 Berry Road
Waldorf, MD 20603 | | |
| Mattawoman Creek Art Center | 5565 Upham PlaceSmallwood State Park
Marbury, MD 20658 | (301) 743-5159 | |
| Mattawoman Community Center | 10145 Berry Rd.
Waldorf, MD 20603 | (301) 645-6865 | |
| Master Suites Hotel - Waldorf | 2228 Old Washington Rd
Waldorf, MD 20601 | (301) 870-5500 | |
| Maryland Veterans Museum at Patriot Park | 11000 Crain Highway
Newburg, MD 20664 | (301) 932-1900 | |
| Maryland Transportation Authority Governor Harry W. Nice Memorial Bridge | 9665 Orland Park Road
Newburg, MD 20664 | (301) 259-4444 | |
| Maryland State Police - Barrack H | 9500 Mitchell Road
La Plata, MD 20646 | (301) 392-1200 | |
| Maryland International Raceway | 27861 Budds Creek Road
Mechanicsville , MD 20659 | | |
| Maryland Department of Natural Resources Southern Region Waldorf Office (Area 4) | 2160 Old Washington Road
Waldorf, MD 20601 | (800) 628-9944 | |
| Mary H. Matula Elementary School | 6025 Radio Station Road
La Plata, MD 20646 | | |
| Mary B. Neal Elementary School | 12105 St. George's Drive
Waldorf, MD 20602 | | |
| Martin's Soul Food & BBQ | 11481 Berry Road
Waldorf, MD 20603 | (301) 375-7247 | |
| Martini's Restaurant & Lounge | 10553 Theodore Green Boulevard
White Plains, MD 20695 | (301) 343-2058 | |
| Marshall Hall Boat Ramp | 1005 Marshall Hall Road
Bryans Road, MD 20616 | (301) 932-3470 | |
| Marshall Hall | 1005 Marshall Hall Rd
Bryans Rd, MD 20616 | (301) 932-3470 | |
