| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
|---|
| Macedonia | city | Connecticut | United States | 41.74278 | -73.49944 | 469 | 3457 |
| Madison | city | Connecticut | United States | 41.27944 | -72.59889 | 68 | 12907 |
| Manchester | city | Connecticut | United States | 41.77583 | -72.52194 | 226 | 64690 |
| Manchester Green | city | Connecticut | United States | 41.785 | -72.50083 | 403 | 64690 |
| Manitock Spring | city | Connecticut | United States | 41.35278 | -72.16222 | 98 | 46209 |
| Mansfield Center | city | Connecticut | United States | 41.76528 | -72.19861 | 291 | 19559 |
| Mansfield City | city | Connecticut | United States | 41.76583 | -72.23417 | 429 | 28410 |
| Mansfield Depot | city | Connecticut | United States | 41.80139 | -72.30694 | 298 | 17256 |
| Mansfield Four Corners | city | Connecticut | United States | 41.82722 | -72.26667 | 666 | 21019 |
| Mansfield Hollow | city | Connecticut | United States | 41.7575 | -72.18639 | 259 | 19559 |
| Marble Dale | city | Connecticut | United States | 41.66361 | -73.36944 | 597 | 8695 |
| Margerie Manor | city | Connecticut | United States | 41.45222 | -73.46778 | 685 | 58321 |
| Marion | city | Connecticut | United States | 41.56361 | -72.92611 | 187 | 44024 |
| Marlborough | city | Connecticut | United States | 41.63139 | -72.46028 | 413 | 11262 |
| Maromas | city | Connecticut | United States | 41.54333 | -72.56111 | 78 | 11971 |
| Mashapaug | city | Connecticut | United States | 42.02722 | -72.13861 | 698 | 3378 |
| Massapeag | city | Connecticut | United States | 41.45778 | -72.08139 | 19 | 29211 |
| Massomuck historical | city | Connecticut | United States | 41.8975 | -71.96306 | 580 | 4878 |
| Maushantuxet historical | city | Connecticut | United States | 41.43972 | -72.01556 | 298 | 18764 |
| Mayberry Village | city | Connecticut | United States | 41.77861 | -72.58694 | 98 | 76974 |
| McClaveville | city | Connecticut | United States | 42.03972 | -73.09667 | 1292 | 2243 |
| Meadowbrook | city | Connecticut | United States | 41.48667 | -72.88194 | 298 | 40374 |
| Meadowgate | city | Connecticut | United States | 41.94694 | -72.79139 | 200 | 15832 |
| Mechanicsville | city | Connecticut | United States | 41.96889 | -72.79417 | 196 | 10321 |
| Mechanicsville | city | Connecticut | United States | 41.94 | -71.89417 | 377 | 13557 |
| Melrose | city | Connecticut | United States | 41.9375 | -72.52167 | 131 | 23139 |
| Melville Village | city | Connecticut | United States | 41.19111 | -73.235 | 114 | 170436 |
| Meriden | city | Connecticut | United States | 41.53806 | -72.8075 | 196 | 74673 |
| Merrow | city | Connecticut | United States | 41.82444 | -72.31083 | 531 | 17256 |
| Merwinsville | city | Connecticut | United States | 41.6475 | -73.48333 | 275 | 7022 |
| Miami Shores | city | Connecticut | United States | 41.28444 | -72.27806 | 0 | 5389 |
| Mianus | city | Connecticut | United States | 41.04389 | -73.59167 | 22 | 79410 |
| Middle Beach | city | Connecticut | United States | 41.27028 | -72.59472 | 0 | 12907 |
| Middle Haddam | city | Connecticut | United States | 41.55389 | -72.55056 | 137 | 11971 |
| Middlebury | city | Connecticut | United States | 41.52778 | -73.12806 | 721 | 17907 |
| Middlefield | city | Connecticut | United States | 41.51722 | -72.7125 | 196 | 33882 |
| Middletown | city | Connecticut | United States | 41.56222 | -72.65111 | 13 | 45466 |
| Midway | city | Connecticut | United States | 41.34139 | -72.03389 | 72 | 34438 |
| Milestone Corner | city | Connecticut | United States | 41.515 | -72.27528 | 498 | 6597 |
| Milford | city | Connecticut | United States | 41.22222 | -73.05694 | 9 | 60052 |
| Milford Lawns | city | Connecticut | United States | 41.22472 | -73.00806 | 49 | 56999 |
| Mill Brook | city | Connecticut | United States | 41.96333 | -73.12 | 1200 | 6664 |
| Mill Hill | city | Connecticut | United States | 41.17722 | -73.16056 | 19 | 151754 |
| Mill Plain | city | Connecticut | United States | 41.395 | -73.51611 | 469 | 38305 |
| Mill Plain | city | Connecticut | United States | 41.14861 | -73.27083 | 55 | 68177 |
| Mill Plain | city | Connecticut | United States | 41.555 | -73.01306 | 498 | 114766 |
| Mill Pond Village | city | Connecticut | United States | 41.92028 | -72.53972 | 160 | 23139 |
| Millbrook | city | Connecticut | United States | 41.37917 | -72.89333 | 141 | 58803 |
| Milldale | city | Connecticut | United States | 41.56583 | -72.89222 | 131 | 42725 |
| Miller Memorial Community | city | Connecticut | United States | 41.53111 | -72.79778 | 298 | 74673 |
| Millington | city | Connecticut | United States | 41.48583 | -72.35583 | 446 | 5205 |
| Millstone | city | Connecticut | United States | 41.31083 | -72.16694 | 0 | 16557 |
| Millville | city | Connecticut | United States | 41.49083 | -73.0675 | 265 | 53817 |
| Millville historical | city | Connecticut | United States | 41.11833 | -73.5025 | 196 | 105415 |
| Milton | city | Connecticut | United States | 41.77 | -73.27306 | 1010 | 3910 |
| Minortown | city | Connecticut | United States | 41.57611 | -73.17472 | 511 | 11124 |
| Miramichi | city | Connecticut | United States | 41.54972 | -72.70111 | 298 | 50016 |
| Miry Brook | city | Connecticut | United States | 41.36639 | -73.48278 | 597 | 44287 |
| Mitcheltown | city | Connecticut | United States | 41.85833 | -73.46083 | 898 | 2633 |
| Mixville | city | Connecticut | United States | 41.52222 | -72.93611 | 200 | 38343 |
| Mohegan | city | Connecticut | United States | 41.47667 | -72.10028 | 308 | 31583 |
| Mohegan historical | city | Connecticut | United States | 41.47667 | -72.10028 | 308 | 31583 |
| Momauguin | city | Connecticut | United States | 41.25194 | -72.87667 | 6 | 120705 |
| Monroe | city | Connecticut | United States | 41.3325 | -73.20778 | 600 | 40386 |
| Montowese | city | Connecticut | United States | 41.35028 | -72.86028 | 88 | 66036 |
| Montville Center | city | Connecticut | United States | 41.47889 | -72.15167 | 311 | 18778 |
| Moodus | city | Connecticut | United States | 41.50278 | -72.45056 | 236 | 6788 |
| Mooreville | city | Connecticut | United States | 41.90944 | -73.06056 | 1000 | 12466 |
| Moosup | city | Connecticut | United States | 41.71278 | -71.88139 | 265 | 15658 |
| Morgan Fair Corners | city | Connecticut | United States | 41.40861 | -73.30611 | 439 | 17034 |
| Morningside | city | Connecticut | United States | 41.21278 | -73.01028 | 0 | 56999 |
| Morningside Park | city | Connecticut | United States | 41.34806 | -72.12778 | 88 | 46209 |
| Morningside Park subdivision | city | Connecticut | United States | 41.33889 | -72.13944 | 62 | 46209 |
| Morris | city | Connecticut | United States | 41.68417 | -73.19667 | 1099 | 6853 |
| Morris Cove | city | Connecticut | United States | 41.25806 | -72.89194 | 26 | 120705 |
| Mount Carmel | city | Connecticut | United States | 41.42417 | -72.90583 | 124 | 43295 |
| Mount Carmel Center | city | Connecticut | United States | 41.43861 | -72.91 | 118 | 43295 |
| Mount Hope | city | Connecticut | United States | 41.82389 | -72.17139 | 334 | 11349 |
| Mount Parnassus | city | Connecticut | United States | 41.47167 | -72.41333 | 508 | 5479 |
| Mount Pleasant Housing subdivision | city | Connecticut | United States | 41.67083 | -72.80194 | 259 | 97409 |
| Mountaincrest | city | Connecticut | United States | 41.47056 | -72.94028 | 387 | 29866 |
| Mudgetown | city | Connecticut | United States | 41.89556 | -73.47667 | 698 | 2661 |
| Murray | city | Connecticut | United States | 41.19444 | -73.28611 | 288 | 89747 |
| Myrtle Beach | city | Connecticut | United States | 41.19611 | -73.07694 | 0 | 43203 |
| Mystic | city | Connecticut | United States | 41.35417 | -71.96694 | 3 | 18113 |
| Mystic Seaport | city | Connecticut | United States | 41.36111 | -71.96694 | 3 | 18113 |
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