| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Madelyn Gardens | city | Delaware | United States | 39.79 | -75.53 | 236 | |
| Magnolia | city | Delaware | United States | 39.07 | -75.48 | 3 | |
| Magnolia Mobile Home Park | city | Delaware | United States | 39.07 | -75.48 | 3 | |
| Magnolia Shores | city | Delaware | United States | 38.48 | -75.11 | 6 | |
| Mahan | city | Delaware | United States | 39.07 | -75.72 | 49 | |
| Mallard Point | city | Delaware | United States | 38.75 | -75.21 | 19 | |
| Mallard Pond | city | Delaware | United States | 39.16 | -75.56 | 42 | |
| Mallards Run | city | Delaware | United States | 39.30 | -75.60 | 19 | |
| Manchester Square | city | Delaware | United States | 39.17 | -75.51 | 3 | |
| Manette Heights | city | Delaware | United States | 39.72 | -75.66 | 59 | |
| Manley | city | Delaware | United States | 39.78 | -75.70 | 298 | |
| Manor Park | city | Delaware | United States | 39.69 | -75.60 | 49 | |
| Manor Park Apartments | city | Delaware | United States | 39.69 | -75.58 | 49 | |
| Maplechase | city | Delaware | United States | 39.82 | -75.50 | 298 | |
| Maplecrest | city | Delaware | United States | 39.73 | -75.65 | 91 | |
| Maplehurst | city | Delaware | United States | 39.25 | -75.57 | 9 | |
| Maplewood | city | Delaware | United States | 38.73 | -75.14 | 32 | |
| Marabou Meadows | city | Delaware | United States | 39.59 | -75.75 | 49 | |
| Marker Estates | city | Delaware | United States | 39.21 | -75.57 | 13 | |
| Markeys Mobile Home Park | city | Delaware | United States | 39.10 | -75.51 | 3 | |
| Marshallton | city | Delaware | United States | 39.73 | -75.65 | 78 | |
| Marshallton Green | city | Delaware | United States | 39.73 | -75.64 | 82 | |
| Marshallton Heights II | city | Delaware | United States | 39.72 | -75.64 | 68 | |
| Marshtown | city | Delaware | United States | 38.69 | -75.16 | 19 | |
| Marvels Crossroads | city | Delaware | United States | 38.93 | -75.52 | 49 | |
| Marydale | city | Delaware | United States | 39.66 | -75.70 | 49 | |
| Marydel | city | Delaware | United States | 39.11 | -75.74 | 49 | |
| Masonicville | city | Delaware | United States | 39.72 | -75.61 | 88 | |
| Massey Landing | city | Delaware | United States | 38.63 | -75.10 | 3 | |
| Mastens Corner | city | Delaware | United States | 38.97 | -75.62 | 62 | |
| Mastens Heights Mobile Home Park | city | Delaware | United States | 38.73 | -75.13 | 29 | |
| Mayfair | city | Delaware | United States | 39.13 | -75.54 | 19 | |
| Mayfield | city | Delaware | United States | 39.80 | -75.51 | 265 | |
| Mayview Manor | city | Delaware | United States | 39.70 | -75.55 | 22 | |
| McClellandville | city | Delaware | United States | 39.71 | -75.78 | 200 | |
| McDaniel Heights | city | Delaware | United States | 39.80 | -75.55 | 298 | |
| McDonalds Crossroads | city | Delaware | United States | 38.67 | -75.45 | 45 | |
| McDonough | city | Delaware | United States | 39.49 | -75.65 | 49 | |
| McKnatt Corners | city | Delaware | United States | 38.94 | -75.68 | 65 | |
| McNichol Place | city | Delaware | United States | 38.75 | -75.16 | 19 | |
| Meadow Acres | city | Delaware | United States | 38.66 | -75.57 | 19 | |
| Meadow Glen | city | Delaware | United States | 39.12 | -75.54 | 19 | |
| Meadow Ridge | city | Delaware | United States | 39.14 | -75.62 | 49 | |
| Meadow Vista | city | Delaware | United States | 39.38 | -75.71 | 49 | |
| Meadowbrook | city | Delaware | United States | 39.75 | -75.72 | 200 | |
| Meadowbrook Acres | city | Delaware | United States | 39.06 | -75.54 | 49 | |
| Meadowbrook Farms | city | Delaware | United States | 39.51 | -75.72 | 49 | |
| Meadowbrook Farms South | city | Delaware | United States | 39.50 | -75.72 | 49 | |
| Meadowood | city | Delaware | United States | 39.71 | -75.69 | 62 | |
| Meadows | city | Delaware | United States | 38.65 | -75.57 | 19 | |
| Mechanicsville | city | Delaware | United States | 39.72 | -75.78 | 285 | |
| Meeting House Hill | city | Delaware | United States | 39.79 | -75.69 | 298 | |
| Meeting House Meadows | city | Delaware | United States | 39.79 | -75.69 | 298 | |
| Melanie | city | Delaware | United States | 39.66 | -75.63 | 49 | |
| Melbourne Manor | city | Delaware | United States | 39.10 | -75.61 | 49 | |
| Melody Meadows | city | Delaware | United States | 39.59 | -75.75 | 49 | |
| Melody Meadows II | city | Delaware | United States | 39.60 | -75.75 | 49 | |
| Melvin Crossroads | city | Delaware | United States | 38.92 | -75.72 | 68 | |
| Melvins | city | Delaware | United States | 38.94 | -75.52 | 49 | |
| Melvins Crossroads | city | Delaware | United States | 38.96 | -75.53 | 49 | |
| Mendenhall Village | city | Delaware | United States | 39.76 | -75.69 | 272 | |
| Mermaid | city | Delaware | United States | 39.74 | -75.69 | 200 | |
| Mermaid Run | city | Delaware | United States | 39.74 | -75.69 | 200 | |
| Messick Development | city | Delaware | United States | 38.70 | -75.54 | 19 | |
| Meyle Estates | city | Delaware | United States | 38.54 | -75.09 | 13 | |
| Middleboro Crest | city | Delaware | United States | 39.72 | -75.59 | 59 | |
| Middleboro East | city | Delaware | United States | 39.72 | -75.54 | 22 | |
| Middleboro Manor | city | Delaware | United States | 39.72 | -75.58 | 59 | |
| Middleford | city | Delaware | United States | 38.67 | -75.57 | 3 | |
| Middleford Acres | city | Delaware | United States | 38.68 | -75.61 | 22 | |
| Middlesex Beach | city | Delaware | United States | 38.52 | -75.05 | 0 | |
| Middletown | city | Delaware | United States | 39.45 | -75.72 | 49 | |
| Midnight Thicket | city | Delaware | United States | 38.58 | -75.54 | 19 | |
| Midvale | city | Delaware | United States | 39.66 | -75.61 | 36 | |
| Midway | city | Delaware | United States | 38.73 | -75.13 | 29 | |
| Midway Estates | city | Delaware | United States | 38.73 | -75.16 | 29 | |
| Midway Park | city | Delaware | United States | 38.74 | -75.14 | 22 | |
| Midway Park Subdivision | city | Delaware | United States | 38.74 | -75.14 | 22 | |
| Mifflin Meadows | city | Delaware | United States | 39.09 | -75.55 | 22 | |
| Milford | city | Delaware | United States | 38.91 | -75.43 | 19 | |
| Milford Crossing | city | Delaware | United States | 38.93 | -75.44 | 19 | |
| Milford Crossroads | city | Delaware | United States | 39.72 | -75.74 | 298 | |
| Milford Meadows | city | Delaware | United States | 38.97 | -75.41 | 19 | |
| Milford Meadows | city | Delaware | United States | 39.71 | -75.73 | 98 | |
| Mill Creek | city | Delaware | United States | 39.78 | -75.70 | 298 | |
| Mill Creek Manor | city | Delaware | United States | 38.76 | -75.20 | 19 | |
| Mill Pond Acres | city | Delaware | United States | 38.76 | -75.20 | 19 | |
| Mill Run Acres | city | Delaware | United States | 38.55 | -75.11 | 9 | |
| Millcreek | city | Delaware | United States | 39.29 | -75.62 | 19 | |
| Miller Creek Park Mobile Home Park | city | Delaware | United States | 38.51 | -75.10 | 19 | |
| Millpond Acres | city | Delaware | United States | 38.76 | -75.20 | 13 | |
| Millsboro | city | Delaware | United States | 38.59 | -75.29 | 19 | |
| Millside | city | Delaware | United States | 39.72 | -75.55 | 22 | |
| Milltown | city | Delaware | United States | 39.73 | -75.67 | 98 | |
| Millville | city | Delaware | United States | 38.55 | -75.12 | 13 | |
| Milton | city | Delaware | United States | 38.78 | -75.31 | 19 | |
| Minners Corners | city | Delaware | United States | 38.97 | -75.63 | 62 | |
| Minquadale | city | Delaware | United States | 39.71 | -75.57 | 49 | |
| Minquadale Trailer Village | city | Delaware | United States | 39.70 | -75.57 | 49 | |
| Mispillion Light | city | Delaware | United States | 38.95 | -75.31 | 3 | |
| Mission | city | Delaware | United States | 38.55 | -75.35 | 42 | |
| Misty Pines | city | Delaware | United States | 39.06 | -75.48 | 3 | |
| Mitchell Estates | city | Delaware | United States | 39.75 | -75.66 | 200 | |
| Mobile Gardens Mobile Home Park | city | Delaware | United States | 38.63 | -75.59 | 19 | |
| Mockingbird Hill | city | Delaware | United States | 39.76 | -75.68 | 275 | |
| Mockingbird Hills | city | Delaware | United States | 39.76 | -75.68 | 275 | |
| Monroe Park | city | Delaware | United States | 39.77 | -75.60 | 196 | |
| Montchan | city | Delaware | United States | 39.78 | -75.59 | 196 | |
| Montchanin | city | Delaware | United States | 39.79 | -75.59 | 275 | |
| Montclare | city | Delaware | United States | 39.73 | -75.68 | 98 | |
| Monterey Farms | city | Delaware | United States | 39.63 | -75.64 | 49 | |
| Montgomery Woods | city | Delaware | United States | 39.80 | -75.67 | 213 | |
| Moores Acres | city | Delaware | United States | 39.62 | -75.66 | 49 | |
| Moores Corner | city | Delaware | United States | 39.21 | -75.61 | 49 | |
| Moores Lake Development | city | Delaware | United States | 39.13 | -75.52 | 9 | |
| Morris Estates | city | Delaware | United States | 39.15 | -75.52 | 9 | |
| Morris Mill | city | Delaware | United States | 38.64 | -75.32 | 19 | |
| Mount Cuba | city | Delaware | United States | 39.79 | -75.64 | 196 | |
| Mount Joy | city | Delaware | United States | 38.63 | -75.30 | 26 | |
| Mount Pleasant | city | Delaware | United States | 39.51 | -75.71 | 49 | |
| Mount Pleasant Mobile Home Park | city | Delaware | United States | 39.52 | -75.71 | 49 | |
| Mulberry Landing | city | Delaware | United States | 38.49 | -75.08 | 0 | |
| Munsee | city | Delaware | United States | 39.82 | -75.50 | 298 | |
| Murray Estates | city | Delaware | United States | 38.56 | -75.08 | 6 | |
| Murrays Corner | city | Delaware | United States | 38.75 | -75.15 | 19 | |
| Murrays Development | city | Delaware | United States | 38.70 | -75.38 | 49 | |
| Murrays Haven | city | Delaware | United States | 38.55 | -75.10 | 9 | |
| Murry Landing | city | Delaware | United States | 38.57 | -75.09 | 3 |