Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Methow Valley State Airport | Airport | 518 | Okanogan | 48 25 30 N | 120 08 43 W |
| Methow Wildlife Area | Park | 1043 | Okanogan | 48 33 30 N | 120 09 04 W |
| Methow Wildlife Recreation Area | Park | 890 | Okanogan | 48 25 32 N | 120 03 11 W |
| Metropolitan Seattle Sweyolocken Pumping Station | Building | 7 | King | 47 35 02 N | 122 11 14 W |
| Metum | Populated Place | 9 | King | 47 41 30 N | 122 24 14 W |
| Meydenbauer Bay | Bay | 5 | King | 47 36 38 N | 122 13 01 W |
| Meydenbauer Park | Park | 35 | King | 47 36 43 N | 122 12 40 W |
| Meydenbauer Yacht Club | Locale | 24 | King | 47 36 32 N | 122 12 27 W |
| Meyer Dam Number One | Dam | 489 | Douglas | 47 26 23 N | 119 43 34 W |
| Meyer Dam Number Two | Dam | 484 | Douglas | 47 26 59 N | 119 44 16 W |
| Meyer Ranch | Locale | 579 | Chelan | 47 56 03 N | 119 56 54 W |
| Meyer Ranch | Locale | 1239 | Okanogan | 48 34 60 N | 119 51 37 W |
| Meyer Ridge | Ridge | 932 | Asotin | 46 12 36 N | 117 10 23 W |
| Meyers Falls | Falls | 454 | Stevens | 48 35 39 N | 118 03 35 W |
| Meyers Falls Cemetery | Cemetery | 496 | Stevens | 48 36 24 N | 118 03 46 W |
| Meyers Falls Dam | Dam | 463 | Stevens | 48 35 42 N | 118 03 28 W |
| Meyers Falls Reservoir | Reservoir | 458 | Stevens | 48 35 43 N | 118 03 28 W |
| Meystre Canyon | Valley | | Yakima | 46 44 53 N | 120 45 57 W |
| Miami Beach | Beach | 5 | Kitsap | 47 39 07 N | 122 50 18 W |
| Mica | Populated Place | 757 | Spokane | 47 33 22 N | 117 12 44 W |
| Mica Cemetery | Cemetery | 759 | Spokane | 47 32 36 N | 117 12 57 W |
| Mica Creek | Stream | | Spokane | 47 27 12 N | 117 08 04 W |
| Mica Creek Cemetery | Cemetery | 797 | Spokane | 47 31 18 N | 117 06 38 W |
| Mica Lake | Lake | 1660 | Snohomish | 48 09 55 N | 121 09 35 W |
| Mica Mountain | Summit | 1191 | Ferry | 47 59 49 N | 118 46 01 W |
| Mica Peak | Locale | 1546 | Spokane | 47 34 24 N | 117 04 52 W |
| Mica Peak Air Force Station (historical) | Military (Historical) | | Spokane | 47 34 25 N | 117 04 53 W |
| Mica Peak Cemetery | Cemetery | 803 | Spokane | 47 30 28 N | 117 04 39 W |
| Michael Lake | Lake | 1559 | Kittitas | 47 28 12 N | 121 04 48 W |
| Michaels Ranch | Locale | 358 | Clallam | 47 57 11 N | 123 33 14 W |
| Michigan Hill | Populated Place | 133 | Thurston | 46 46 40 N | 123 06 02 W |
| Michigan Hill | Summit | 137 | Thurston | 46 46 35 N | 123 07 01 W |
| Michigan Prairie | Flat | 437 | Adams | 46 45 56 N | 118 39 04 W |
| Michigan Prairie Cemetery | Cemetery | 435 | Adams | 46 45 04 N | 118 39 42 W |
| Mick Creek | Stream | | Ferry | 48 45 31 N | 118 25 38 W |
| Mickey Creek | Stream | | Pend Oreille | 48 46 09 N | 117 23 57 W |
| Mid Valley Hospital | Hospital | 260 | Okanogan | 48 23 49 N | 119 32 48 W |
| Midas Creek | Stream | | Skagit | 48 29 03 N | 121 05 12 W |
| Midchannel Bank | Bar | -13 | Jefferson | 48 06 47 N | 122 42 30 W |
| Middle Bank | Bar | 3 | San Juan | 48 24 20 N | 123 06 25 W |
| Middle Branch Elk River | Stream | | Grays Harbor | 46 49 33 N | 123 58 13 W |
| Middle Branch Le Clerc Creek | Stream | | Pend Oreille | 48 35 07 N | 117 15 41 W |
| Middle Branch Newman Creek | Stream | | Grays Harbor | 47 01 55 N | 123 26 42 W |
| Middle Branch North Fork Asotin Creek | Stream | | Garfield | 46 11 46 N | 117 25 58 W |
| Middle Branch North Fork Stillaguamish River | Stream | | Skagit | 48 23 03 N | 121 37 00 W |
| Middle Butte | Summit | 1036 | Skamania | 45 55 18 N | 121 55 45 W |
| Middle Canyon | Valley | | Kittitas | 46 52 48 N | 119 59 30 W |
| Middle Cascade Glacier | Glacier | 1761 | Skagit | 48 25 11 N | 121 03 16 W |
| Middle Channel | Channel | -4 | Grays Harbor | 46 57 19 N | 123 54 24 W |
| Middle Channel | Channel | -4 | San Juan | 48 24 58 N | 122 56 42 W |
| Middle Creek | Stream | | Chelan | 47 18 36 N | 120 18 34 W |
| Middle Creek | Stream | | Clallam | 48 23 19 N | 124 40 01 W |
| Middle Creek | Stream | | Clallam | 48 09 25 N | 124 07 58 W |
| Middle Creek | Stream | | Kittitas | 47 17 42 N | 120 51 23 W |
| Middle Creek | Stream | | Pend Oreille | 48 30 01 N | 117 15 46 W |
| Middle Creek | Stream | | Whatcom | 48 51 58 N | 120 53 11 W |
| Middle Falls | Falls | 534 | Skamania | 46 10 01 N | 121 51 46 W |
| Middle Fork | Stream | | Okanogan | 48 26 19 N | 119 58 56 W |
| Middle Fork Ahtanum Creek | Stream | | Yakima | 46 31 03 N | 121 00 54 W |
| Middle Fork Big Creek | Stream | | Grays Harbor | 47 24 15 N | 123 39 31 W |
| Middle Fork Boulder Creek | Stream | | Okanogan | 48 36 39 N | 120 02 50 W |
| Middle Fork Buck Creek | Stream | | Klickitat | 45 52 08 N | 121 35 29 W |
| Middle Fork Calispell Creek | Stream | | Pend Oreille | 48 15 33 N | 117 25 10 W |
| Middle Fork Camp | Locale | 1011 | Klickitat | 45 51 31 N | 121 35 24 W |
| Middle Fork Canyon | Valley | | Yakima | 46 51 28 N | 120 45 43 W |
| Middle Fork Cascade River | Stream | | Skagit | 48 26 41 N | 121 08 08 W |
| Middle Fork Chamokane Creek | Stream | | Stevens | 48 01 11 N | 117 53 03 W |
| Middle Fork Deer Creek | Stream | | Stevens | 48 06 47 N | 117 54 28 W |
| Middle Fork Dickey River | Stream | | Clallam | 48 05 02 N | 124 30 11 W |
| Middle Fork Dry Creek | Stream | | Yakima | 46 10 36 N | 120 46 02 W |
| Middle Fork Flume Creek | Stream | | Pend Oreille | 48 54 11 N | 117 23 08 W |
| Middle Fork Gold Creek | Stream | | Okanogan | 48 11 29 N | 120 09 33 W |
| Middle Fork Harvey Creek | Stream | | Pend Oreille | 48 45 02 N | 117 12 42 W |
| Middle Fork Hoquiam River | Stream | | Grays Harbor | 47 01 56 N | 123 55 12 W |
| Middle Fork Johnson Creek | Stream | | Lewis | 46 30 58 N | 121 35 50 W |
| Middle Fork Little Boulder Creek | Stream | | Ferry | 48 54 31 N | 118 17 27 W |
| Middle Fork Little Naches River | Stream | | Yakima | 47 05 21 N | 121 16 53 W |
| Middle Fork McCreedy Creek | Stream | | Yakima | 46 20 17 N | 121 15 04 W |
| Middle Fork Mill Creek | Stream | | Stevens | 48 37 20 N | 117 45 18 W |
| Middle Fork Newaukum River | Stream | | Lewis | 46 36 11 N | 122 50 15 W |
| Middle Fork Nooksack River | Stream | | Whatcom | 48 50 02 N | 122 09 18 W |
| Middle Fork O'Brien Creek | Stream | | Ferry | 48 36 15 N | 118 36 08 W |
| Middle Fork Palix River | Stream | | Pacific | 46 35 53 N | 123 53 51 W |
| Middle Fork Paris Creek | Stream | | Kittitas | 47 24 24 N | 121 01 50 W |
| Middle Fork Pasayten River | Stream | | Okanogan | 48 54 06 N | 120 37 59 W |
| Middle Fork Prince Creek | Stream | | Chelan | 48 12 16 N | 120 26 26 W |
| Middle Fork Quartz Creek | Stream | | Klickitat | 45 54 14 N | 120 33 31 W |
| Middle Fork Quilceda Creek | Stream | | Snohomish | 48 06 17 N | 122 09 46 W |
| Middle Fork Ridge | Ridge | 1416 | Okanogan | 48 10 45 N | 120 13 35 W |
| Middle Fork Rue Creek | Stream | | Pacific | 46 36 17 N | 123 40 46 W |
| Middle Fork Salmon River | Stream | | Jefferson | 47 31 27 N | 124 02 28 W |
| Middle Fork Sanpoil River | Stream | | Ferry | 48 40 06 N | 118 36 42 W |
| Middle Fork Satsop River | Stream | | Mason | 47 05 01 N | 123 29 06 W |
| Middle Fork Silesia Creek | Stream | | Whatcom | 48 56 34 N | 121 32 02 W |
| Middle Fork Siwash Creek | Stream | | Okanogan | 48 43 04 N | 119 12 53 W |
| Middle Fork Snoqualmie River | Stream | | King | 47 31 14 N | 121 46 32 W |
| Middle Fork South Fork Sultan River | Stream | | Snohomish | 47 56 08 N | 121 36 17 W |
| Middle Fork Taylor Creek | Stream | | King | 47 21 20 N | 121 48 20 W |
| Middle Fork Teanaway River | Stream | | Kittitas | 47 15 24 N | 120 53 54 W |
| Middle Fork Toats Coulee Creek | Stream | | Okanogan | 48 50 08 N | 119 46 52 W |
| Middle Fork Trail | Trail | 467 | King | 47 29 39 N | 121 26 50 W |
| Middle Fork Trail | Trail | 1180 | Yakima | 47 03 54 N | 121 19 13 W |
| Middle Fork Twentymile Creek | Stream | | Okanogan | 48 45 28 N | 119 57 49 W |
| Middle Foster Creek | Stream | | Douglas | 47 56 08 N | 119 40 22 W |
| Middle Hidden Lake | Lake | 1340 | Okanogan | 48 54 28 N | 120 29 21 W |
| Middle Lake | Lake | 196 | Skamania | 45 42 54 N | 121 44 07 W |
| Middle Lakes | Lake | 1747 | Whatcom | 48 53 09 N | 121 21 14 W |
| Middle Lands | Locale | 17 | Clark | 45 51 00 N | 122 45 37 W |
| Middle Mountain | Summit | 955 | Ferry | 48 08 23 N | 118 18 06 W |
| Middle Mountain | Summit | 1429 | Okanogan | 48 37 55 N | 119 46 49 W |