Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Mexican Spring | Spring | 1706 | Fremont | 43 27 49 N | 108 25 55 W |
| Mexican Springs | Stream | | Campbell | 43 32 35 N | 105 40 02 W |
| Meyer Basin | Basin | 2282 | Fremont | 42 43 18 N | 108 47 52 W |
| Meyer Lookout | Summit | 2870 | Fremont | 42 40 44 N | 108 51 23 W |
| Meyers Gulch | Valley | | Washakie | 44 00 24 N | 107 37 27 W |
| Meyers Mine | Mine | 1610 | Natrona | 42 58 22 N | 106 20 50 W |
| Meyers Ranch | Locale | 1400 | Goshen | 42 20 01 N | 104 35 34 W |
| Meyers Ridge | Ridge | 2273 | Uinta | 41 14 50 N | 110 35 56 W |
| Miami Ditch | Canal | 2323 | Sublette | 42 32 18 N | 110 23 55 W |
| Mica Lake | Lake | 2915 | Teton | 43 47 01 N | 110 50 39 W |
| Michael Manor Health Care Center | Hospital | 1475 | Converse | 42 45 35 N | 105 22 56 W |
| Michaels Dam | Dam | 1186 | Weston | 43 45 24 N | 104 21 08 W |
| Michaels Reservoir | Reservoir | 1186 | Weston | 43 45 24 N | 104 21 08 W |
| Michelson Spring | Spring | 1901 | Crook | 44 13 16 N | 104 05 13 W |
| Michigan Mine | Mine | 1714 | Goshen | 42 33 50 N | 104 36 33 W |
| Mickelberry Creek | Stream | | Johnson | 44 34 47 N | 106 04 44 W |
| Mickelson Creek | Stream | | Sublette | 42 45 59 N | 110 21 27 W |
| Mickey 2-10 Mine | Mine | 1574 | Big Horn | 44 59 02 N | 108 09 27 W |
| Mickey Gulch | Valley | | Converse | 42 42 17 N | 105 52 48 W |
| Mickey One Mine | Mine | 1488 | Converse | 42 42 23 N | 105 07 06 W |
| Microwave Pit | Mine | 44 | Johnson | 43 30 23 N | 106 09 03 W |
| Midas Mine | Mine | 2514 | Fremont | 42 30 44 N | 108 43 41 W |
| Middaugh Dam | Dam | 1572 | Campbell | 43 31 36 N | 105 49 02 W |
| Middaugh Reservoir | Reservoir | 1572 | Campbell | 43 31 36 N | 105 49 02 W |
| Middle Bear Creek | Stream | | Platte | 42 24 10 N | 104 56 20 W |
| Middle Beaver Creek | Stream | | Sublette | 43 00 58 N | 110 10 11 W |
| Middle Boone Creek | Stream | | Teton | 44 04 56 N | 111 00 13 W |
| Middle Branch Middle Fork Owl Creek | Stream | | Hot Springs | 43 41 52 N | 108 59 42 W |
| Middle Branch Middle Lodgepole Creek | Stream | | Albany | 41 16 48 N | 105 18 11 W |
| Middle Butte | Summit | 2564 | Sublette | 43 08 31 N | 110 00 23 W |
| Middle Butte | Summit | 1612 | Washakie | 43 51 34 N | 107 33 32 W |
| Middle Camp | Locale | 1784 | Laramie | 41 16 25 N | 104 39 02 W |
| Middle Canyon | Valley | | Laramie | 41 35 00 N | 105 16 01 W |
| Middle Canyon | Valley | | Sweetwater | 41 08 60 N | 109 57 45 W |
| Middle Cedar Creek | Stream | | Carbon | 41 24 10 N | 106 35 50 W |
| Middle Chugwater Creek | Stream | | Laramie | 41 33 56 N | 105 14 21 W |
| Middle Clear Creek | Stream | | Johnson | 44 18 17 N | 106 54 48 W |
| Middle Cloud Peak Lake | Lake | 3177 | Big Horn | 44 22 12 N | 107 12 58 W |
| Middle Cottonwood Dam | Dam | 1514 | Fremont | 43 18 36 N | 108 20 26 W |
| Middle Cottonwood Reservoir | Reservoir | 1514 | Fremont | 43 18 36 N | 108 20 26 W |
| Middle Creek | Stream | | Albany | 41 38 39 N | 105 38 50 W |
| Middle Creek | Stream | | Carbon | 41 33 27 N | 106 32 33 W |
| Middle Creek | Stream | | Hot Springs | 44 00 11 N | 108 46 21 W |
| Middle Creek | Stream | | Laramie | 41 29 04 N | 104 25 37 W |
| Middle Creek | Stream | | Lincoln | 43 05 30 N | 110 44 34 W |
| Middle Creek | Stream | | Niobrara | 42 53 29 N | 104 13 59 W |
| Middle Creek | Stream | | Niobrara | 42 55 24 N | 104 41 20 W |
| Middle Creek | Stream | | Niobrara | 43 17 37 N | 104 51 03 W |
| Middle Creek | Stream | | Park | 44 48 25 N | 109 25 27 W |
| Middle Creek | Stream | | Park | 44 30 03 N | 109 57 25 W |
| Middle Creek | Stream | | Park | 44 14 23 N | 109 05 14 W |
| Middle Creek Number One Mine | Mine | 1032 | Crook | 44 48 11 N | 104 05 14 W |
| Middle Creek Number Two Mine | Mine | 1026 | Crook | 44 47 21 N | 104 04 51 W |
| Middle Creek Reservoir | Reservoir | 1368 | Converse | 43 16 49 N | 104 55 29 W |
| Middle Creek Spring | Spring | 1543 | Niobrara | 42 51 28 N | 104 40 50 W |
| Middle Crow Camp | Locale | 2377 | Albany | 41 10 45 N | 105 19 48 W |
| Middle Crow Creek | Stream | | Laramie | 41 10 32 N | 105 03 37 W |
| Middle Diamond Spring | Spring | 2122 | Fremont | 42 43 25 N | 107 35 37 W |
| Middle Diamond Springs Draw | Valley | | Fremont | 42 41 09 N | 107 35 27 W |
| Middle Ditch | Stream | | Carbon | 41 55 15 N | 106 46 26 W |
| Middle Downey Lake Mine | Mine | 2240 | Albany | 41 05 03 N | 105 47 45 W |
| Middle East Windmill | Locale | 1852 | Laramie | 41 03 43 N | 104 41 16 W |
| Middle Firehole Canyon | Valley | | Sweetwater | 41 24 31 N | 109 24 30 W |
| Middle Fork Arkansas Creek | Stream | | Sheridan | 44 44 56 N | 106 36 52 W |
| Middle Fork Badger Creek | Stream | | Sheridan | 44 53 07 N | 106 34 10 W |
| Middle Fork Beaver Creek | Stream | | Lincoln | 42 08 31 N | 110 36 49 W |
| Middle Fork Beaver Creek | Stream | | Uinta | 41 00 13 N | 110 09 31 W |
| Middle Fork Big Creek | Stream | | Carbon | 41 01 56 N | 106 32 40 W |
| Middle Fork Boulder Creek | Stream | | Sublette | 42 51 18 N | 109 27 57 W |
| Middle Fork Boundary Gulch | Valley | | Crook | 44 28 23 N | 104 03 46 W |
| Middle Fork Buffalo Creek | Stream | | Natrona | 43 25 31 N | 107 11 21 W |
| Middle Fork Bull Lake Creek | Stream | | Fremont | 43 03 42 N | 109 26 54 W |
| Middle Fork Campground | Locale | 2275 | Johnson | 44 18 06 N | 106 57 06 W |
| Middle Fork Casper Creek | Stream | | Natrona | 43 00 52 N | 106 29 35 W |
| Middle Fork Coal Creek | Stream | | Campbell | 43 55 53 N | 105 18 29 W |
| Middle Fork Cottonwood Creek | Stream | | Albany | 42 17 27 N | 105 47 28 W |
| Middle Fork Crazy Woman Creek | Stream | | Johnson | 44 04 35 N | 106 38 47 W |
| Middle Fork Currant Creek | Stream | | Sweetwater | 41 07 39 N | 109 18 02 W |
| Middle Fork Cut Off Trail | Trail | 2694 | Teton | 43 36 02 N | 110 54 56 W |
| Middle Fork Ditch Creek | Stream | | Teton | 43 42 60 N | 110 31 32 W |
| Middle Fork Dow Prong Dutch Creek | Stream | | Sheridan | 44 41 38 N | 106 42 06 W |
| Middle Fork Dry Creek | Stream | | Converse | 42 48 14 N | 105 50 09 W |
| Middle Fork Dry Fork Cheyenne River | Stream | | Converse | 43 08 05 N | 105 50 42 W |
| Middle Fork East Pass Creek | Stream | | Sheridan | 44 54 48 N | 107 28 17 W |
| Middle Fork Elkhorn Creek | Stream | | Natrona | 42 47 02 N | 106 16 52 W |
| Middle Fork Fifteenmile Creek | Stream | | Washakie | 44 04 52 N | 108 12 01 W |
| Middle Fork Fowkes Canyon Creek | Stream | | Uinta | 41 23 51 N | 110 58 49 W |
| Middle Fork Granite Creek | Stream | | Teton | 43 36 46 N | 110 53 36 W |
| Middle Fork Guard Station | Locale | 2155 | Fremont | 42 44 02 N | 108 50 58 W |
| Middle Fork Hay Creek | Stream | | Crook | 44 39 35 N | 104 05 19 W |
| Middle Fork Horseshoe Draw | Valley | | Fremont | 42 51 18 N | 107 51 51 W |
| Middle Fork King Creek | Stream | | Converse | 42 37 60 N | 105 35 41 W |
| Middle Fork Lake | Lake | 3126 | Sublette | 42 54 56 N | 109 22 02 W |
| Middle Fork Lassen Creek | Stream | | Weston | 43 51 13 N | 104 35 13 W |
| Middle Fork Little Canyon Creek | Stream | | Washakie | 43 43 09 N | 107 14 20 W |
| Middle Fork Little Laramie River | Stream | | Albany | 41 14 08 N | 106 05 28 W |
| Middle Fork Long Creek | Stream | | Fremont | 43 38 43 N | 109 50 39 W |
| Middle Fork Mill Creek | Stream | | Albany | 41 22 43 N | 106 01 31 W |
| Middle Fork Miller Creek | Stream | | Crook | 44 28 21 N | 104 33 04 W |
| Middle Fork Mud Creek | Stream | | Hot Springs | 43 39 04 N | 108 25 48 W |
| Middle Fork North Fish Creek | Stream | | Sublette | 42 33 53 N | 110 34 45 W |
| Middle Fork Otter Creek | Stream | | Washakie | 43 51 44 N | 107 13 08 W |
| Middle Fork Owl Creek | Stream | | Hot Springs | 43 39 55 N | 108 50 35 W |
| Middle Fork Phillips Canyon | Valley | | Teton | 43 31 43 N | 110 53 47 W |
| Middle Fork Powder River | Stream | | Johnson | 43 41 60 N | 106 33 32 W |
| Middle Fork Ridge | Ridge | 2682 | Big Horn | 44 16 47 N | 107 20 16 W |
| Middle Fork Rock Creek | Stream | | Carbon | 41 27 41 N | 106 11 26 W |
| Middle Fork Rock Creek | Stream | | Park | 44 16 26 N | 109 22 12 W |
| Middle Fork Sage Creek | Stream | | Carbon | 42 15 13 N | 106 44 28 W |
| Middle Fork Sage Creek | Stream | | Fremont | 43 08 09 N | 108 59 44 W |