- Abbey Island
- Aberdeen
- Aberdeen Gardens
- Aberdeen Junction
- Ackerman Island
- Acme
- Acorn Meadows Mobile Home Park
- Adco
- Addy
- Addy Blue Creek
- Adelaide
- Adelaide
- Adelma Beach
- Adkins
- Adna
- Adolphus Island (historical)
- Adrian
- Adrian
- Aeneas
- Aero Mobile Court
- Agate
- Agate Bay
- Agate Point
- Agnes Island
- Agnew
- Agnew Mobile Home Park
- Ahtanum
- Ainsworth Junction
- Airport Inn Mobile Home Park
- Airway Heights