| 1 | Aasgard Pass | H | 13.00 | 4400 | 2.50 | 100 Hikes in the Alpine Lakes | The Enchantments | Alpine Lakes Wilderness |
| 2 | Abernathy Pass | H | 18.00 | 3400 | 3.50 | 100 Hikes in the North Cascades | Mazama/ Washington Pass | Okanogan N.F., Methow Valley R.D. |
| 3 | Adams Creek Meadows | M | 8.00 | 2300 | 2.50 | 100 Hikes in S. Cascades & Olympics | Mt. Adams West/Blue Lake | Mount Adams Wilderness |
| 4 | Agnes Gorge | E | 5.00 | 350 | 4.00 | Hiking the North Cascades | McGregor Mtn. | Glacier Peak Wilderness |
| 5 | Alder Creek - Mad Lake | H | 17.00 | 2.25 | 100 Hikes in Glacier Peak Region | Plain | Wenatchee N.F., Entiat R.D. | |
| 6 | Alexander Trail | M | 5.50 | 1600 | 1.50 | Footsore 3 | USGS Clear Lake | |
| 7 | Description | Difficulty | miles | gain | drive | Reference | Map | Management Unit |
| 8 | Alice Creek | M | 8.50 | 1300 | 1.00 | Footsore 2 | Bandera | Mt. Baker-Snoqualmie N.F., North Bend R.D. |
| 10 | Alpine Baldy | M | 13.00 | 2400 | 1.50 | 100 Hikes in Glacier Peak Region | Skykomish | Mt. Baker-Snoqualmie N.F., Skykomish R.D. |
| 11 | Alpine Lookout | M | 10.00 | 2.00 | 100 Hikes in Glacier Peak Region | Wenatchee Lake | Wenatchee N.F., Lake Wenatchee R.D. | |
| 12 | Alpine Lookout via Merritt Lake | M | 13.00 | 3300 | 2.00 | 100 Hikes in Glacier Peak Region | Wenatchee Lake | Wenatchee N.F., Lake Wenatchee R.D. |
| 13 | Alta Mountain | M | 12.00 | 3440 | 1.25 | 100 Hikes in the Alpine Lakes | Snoqualmie Pass | Alpine Lakes Wilderness |
| 14 | Description | Difficulty | miles | gain | drive | Reference | Map | Management Unit |
| 15 | American Ridge | M | 12.00 | 2950 | 2.75 | 100 Hikes in S. Cascades & Olympics | Bumping Lake | William O. Douglas Wilderness |
| 16 | Ancient Lakes | M | 6.00 | 800 | 2.25 | 55 Hikes in Central Washington | USGS Babcock Ridge | State Game Department - Wildlife Recreation Area |
| 17 | Ancient Lakes, West Approach | E | 8.00 | 2.25 | 55 Hikes in Central Washington | USGS Babcock Ridge | State Game Department - Wildlife Recreation Area | |
| 18 | Anderson & Watson Lakes & Anderson Butte | M | 7.00 | 2000 | 1.75 | Hiking the North Cascades | Lake Shannon | Noisy-Diobsud Wilderness |
| 19 | Anderson Island | E | 5.00 | 0 | 1.25 | Footsore 4 | USGS Anderson Island | |
| 20 | Anderson Lake | M | 7.50 | 0.75 | 100 Hikes in the Alpine Lakes | Mount Si/Skykomish | Alpine Lakes Wilderness | |
| 21 | Description | Difficulty | miles | gain | drive | Reference | Map | Management Unit |
| 22 | Anderson Ranch | E | 10.00 | 2.25 | Olympic Mountains Trail Guide | Mt. Olympus | Olympic National Park | |
| 23 | Annette Lake | M | 7.50 | 1700 | 1.00 | 100 Hikes in S. Cascades & Olympics | Snoqualmie Pass | Mt. Baker-Snoqualmie N.F., North Bend R.D. |
| 24 | Anti-Aircraft Peak - Clay Pit Peak Loop | E | 5.50 | 550 | 0.50 | Footsore 1 | IATC Cougar Mtn. | City or County Park |
| 25 | Ape Canyon | M | 11.50 | 1300 | 3.25 | 100 Hikes in Northwest Oregon | Mt. St. Helens | Mount St. Helens National Volcanic Monument |
| 26 | Appleton Pass | H | 14.50 | 3300 | 2.25 | 100 Hikes in S. Cascades & Olympics | Mt. Olympus | Olympic National Park |
| 28 | Description | Difficulty | miles | gain | drive | Reference | Map | Management Unit |
| 29 | Ashland Lakes | E | 6.00 | 900 | 1.25 | Footsore 3 | Silverton | State Department of Natural Resources |
| 30 | Ashland Lakes | H | 10.00 | 4100 | 2.50 | Olympic Mountains Trail Guide | Lake Crescent | Olympic National Park |
| 31 | Aurora Ridge to Aurora Cr. One Way | H | 14.00 | 3400 | 2.50 | Olympic Mountains Trail Guide | Lake Crescent | Olympic National Park |
| 32 | Aurora Ridge via Barnes Creek | H | 15.00 | 4150 | 2.50 | Olympic Mountains Trail Guide | Lake Crescent/Joyce | Olympic National Park |
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