Ilwaco
- County:
- Pacific County
- County Seat:
- No
- Area (mi²):
- 2.05
- State:
- Washington
Ilwaco is a city located in Pacific County, Washington. Ilwaco has a 2026 population of 1,112. Ilwaco is currently declining at a rate of -0.09% annually but its population has increased by 1.65% since the most recent census, which recorded a population of 1,094 in 2020.