Seattle City Population 2024 By City. The 2023 adopted budget included. It shows that from july 1, 2020, to july 1, 2021, at the peak of the pandemic, seattle had a net loss of nearly 4,300 people, which represents a decline of 0.6%.

That’s an additional 240,000 or so residents over the next 22 years. The median age in 2021 was 35.3 years, with a median income of $56,758.