Current City Members
| SCA Member Cities & Towns | 2017 OFM Population |
| Skykomish | 200 |
| Beaux Arts Village | 300 |
| Hunts Point | 415 |
| Yarrow Point | 1,040 |
| Milton (King County portion) | 1,195 |
| Carnation | 2,030 |
| Clyde Hill | 3,015 |
| Medina | 3,205 |
| Algona | 3,180 |
| Black Diamond | 4,335 |
| Normandy Park | 6,595 |
| North Bend | 6,605 |
| Pacific (King County portion) | 6,855 |
| Duvall | 7,500 |
| Newcastle | 11,280 |
| Enumclaw (King County portion) | 11,450 |
| Woodinville | 11,660 |
| Lake Forest Park | 12,990 |
| Snoqualmie | 13,210 |
| Tukwila | 19,660 |
| Covington | 19,850 |
| Kenmore | 22,580 |
| Mercer Island | 24,210 |
| Maple Valley | 24,900 |
| Bothell (King County portion) | 26,860 |
| SeaTac | 28,850 |
| Des Moines | 30,860 |
| Issaquah | 36,030 |
| Burien | 50,680 |
| Shoreline | 55,060 |
| Redmond | 62,110 |
| Sammamish | 62,240 |
| Auburn (King County portion) | 69,060 |
| Kirkland | 86,080 |
| Federal Way | 96,350 |
| Renton | 102,700 |
| Kent | 127,100 |
| Bellevue | 140,700 |