Current City Members
| SCA Member Cities & Towns | 2015 OFM Population |
| Skykomish | 195 |
| Beaux Arts Village | 300 |
| Hunts Point | 410 |
| Milton (King County portion) | 1,010 |
| Carnation | 1,790 |
| Clyde Hill | 3,020 |
| Medina | 3,095 |
| Algona | 3,105 |
| Black Diamond | 4,200 |
| Normandy Park | 6,420 |
| North Bend | 6,460 |
| Pacific (King County portion) | 6,770 |
| Duvall | 7,345 |
| Newcastle | 10,940 |
| Enumclaw (King County portion) | 11,140 |
| Woodinville | 11,240 |
| Lake Forest Park | 12,810 |
| Snoqualmie | 12,850 |
| Covington | 18,520 |
| Tukwila | 19,300 |
| Kenmore | 21,500 |
| Mercer Island | 23,480 |
| Maple Valley | 24,700 |
| Bothell (King County portion) | 25,410 |
| SeaTac | 27,650 |
| Des Moines | 30,100 |
| Issaquah | 33,330 |
| Burien | 48,810 |
| Shoreline | 54,500 |
| Redmond | 59,180 |
| Sammamish | 60,980 *estimated |
| Auburn (King County portion) | 65,950 |
| Kirkland | 83,460 |
| Federal Way | 90,760 |
| Renton | 98,470 |
| Kent | 122,900 |
| Bellevue | 135,000 |