| Business | Phone |
| Mercer Island Chamber-Commerce 7613 Se 27th St A, Mercer Island 98040 | (206) 232-3404 |
| Mercer Island Education Assn 9100 Se 42nd St, Mercer Island 98040 | (206) 232-3786 |
| Washington State Obstetrical 10 El Dorado Beach Club Dr, Mercer Island 98040 | (206) 232-9517 |