COVID in King County, charts per city (Aug 20, 2020)

Here are charts for King County cities. These charts rely on the King County outbreak summary dashboard together with population estimates from the JC_Rook’s daily spreadsheet report on King County.

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:

King County

Until early May, King County was the leader in average COVID-19 cases per 100k citizen for the state of Washington. The King County curve sloped down below the state average only to aggressively turn upwards, peaking on July 4th, both to hit the state average and then to decline sharply. Since then, King County has held a comfortable below-average position to date.


Since almost the start, Seattle has maintained a comfortable below-average position against the county with one exception. Like King County, there was an aggressive upward slope at the end of June. This culminated into a record number of cases in early July. Seattle then dropped down to below-average again to resume a below-average position to date.

Seattle boasts a population of 747k which is ⅓ the entire population of King County. As a result, its peaks and valleys are much pronounced in these charts and has an understandable influence on the overall county trend-line.

Auburn, Bryn Mawr-Skyway, Burien, Covington, Federal Way, Kent, Lakeland North, SeaTac, and Tukwila are trending high

By a rough visual review, I would point out these cities as having an above-average trendline for the past few days. Historically, I would note that some of these cities have always maintained an above-average position. Those are Auburn, Federal Way, Kent, SeaTac, Tukwila.

I’ve added Lakeland South in the graphs below as a comparison point for Lakeland North.

Snoqualmie, White Center, North Bend, Woodinville, Lake Morton-Berrydale, Fairwood, and Bothell show success in responding to a recent peak above average

These cities experienced a sharp peak above average, then their number have dropped to or below average in a promising fashion.


I chose these the average and 100k transformations to help readers identify how COVID-19 is trending in each chart and to allow readers to make fairly direct comparisons city-to-city.

These charts compare each city against the entire county. This allows us to say whether or not a city has generally been doing better or worse than the rest of the county. 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 with all cities

Google sheet of WA counties

Subreddit with daily reports from various contributors