COVID in Washington State, county-level (9/11/2021)

Here are charts for Washington State counties. These charts rely on the New York Times’ published data on COVID-19 in the United States. I am primarily use their county-level data set together with population estimates (Wikipedia reports on US Census data from 2019).

I have produced charts of new cases of COVID-19 as

  • 7-day trailing averages
  • scaled to cases per 100k.

Google sheets link

All of my charts and tables are shared in a public Google sheets document:


Washington State is not much lower than the national average

The entire state has a 14-day trailing average of 42.03 cases per 100k. The country equals this at 44.72 cases.

King County’s average is a flat line in the past month, a clear deviation from the national and state-wide peak

King County appeared to cut off its rate of increase in cases about a month ago. It has held steady between 22 and 29 new cases on average. In recent days, there is a possibility of drop.

All counties ranked by trailing average case per 100k as of 9/11/2021

Here is a ranked list of all counties as of 9/11/2021. I have added the nation and Washington State as a whole to help contextualize the numbers.

More than 20 counties in the state are positioned above the state average.

Here are graphs for the top five counties in the state

Lincoln County

Franklin County

Lewis County

Stevens County

Okanogan County


I chose trailing averages and scaled to population (“per 100k”) to help readers identify how COVID-19 is trending in each chart and to allow readers to make fairly direct comparisons county-to-county.
These charts compare each county against the entire state. This allows us to say whether or not a county has generally been doing better or worse than the rest of the state. I am using the trailing averages and trend line comparison to mitigate the way that testing patterns have changed since the early months.
I have refrained from speculation about the reasons for each county’s performance in this post and concentrated on simple language: above vs below average and a month to month comparison.


Google sheet of WA counties
Google sheet with all King County cities
Subreddit with daily reports from various contributors