After adding over 1,076,000 new cases throughout the last week, the U.S. now has more than 41.2 million confirmed cases of COVID-19. There have been more than 650,000 COVID-19-related deaths — the highest death toll of any country.

New cases continue to rise at a steady rate. In the past week, there were an average of 49.5 daily new coronavirus cases per 100,000 Americans — essentially unchanged from the week prior, when there were an average of 45.4 daily new coronavirus cases per 100,000 people.

While COVID-19 has spread to nearly every part of the country, cities continue to be the sites of major outbreaks. Experts agree that the virus is more likely to spread in group settings where large numbers of people routinely have close contact with one another, such as colleges, nursing homes, bars, and restaurants. Metropolitan areas with a high degree of connectivity between different neighborhoods and a large population may be particularly at-risk.

The Portland-Vancouver-Hillsboro, OR-WA, metro area consists of Multnomah County, Washington County, Clark County, and four other counties. In the past week, there were an average of 33.9 new coronavirus cases every day per 100,000 Portland residents, less than the national figure. The metro area’s average daily case growth in the most recent week is essentially unchanged from the week prior, when there were an average of 31.9 daily new cases per 100,000 Portland residents.

The spread of coronavirus depends on a variety of factors and can vary even between neighboring counties. Within the Portland-Vancouver-Hillsboro metro area, COVID-19 is growing the slowest in Multnomah County. There were an average of 27.8 new cases per day per 100,000 residents in Multnomah County during the past week, the least of the seven counties in Portland with available data.

Case growth in the Portland metro area varies at the county level. In Columbia County, for example, there were an average of 53.3 new cases per day per 100,000 residents in the past week — the most of any county in Portland and more than the case growth rate in Multnomah County.

While Multnomah County has the slowest case growth in the Portland area, it does not have the lowest incidence of cases overall. As of September 16, there were a total of 6,243.3 confirmed cases per 100,000 residents in Multnomah County, the fourth fewest of the seven counties in the metro area. For comparison, the U.S. has so far reported 12,697.8 cases per 100,000 Americans nationwide.

In order to slow the spread of COVID-19, city and county governments have ordered the closure of thousands of consumer-facing businesses. These measures have led to widespread job loss and record unemployment. In Multnomah County, unemployment peaked at 15.9% in April 2020. As of June 2021, the county’s unemployment rate was 5.7%.

To determine the county in every metropolitan area where COVID-19 is growing the slowest, 24/7 Wall St. compiled and reviewed data from state and local health departments. We ranked counties according to the average number of new daily COVID-19 cases per 100,000 residents in the seven days ending September 16. To estimate the incidence of COVID-19 at the metropolitan level, we aggregated data from the county level using boundary definitions from the U.S. Census Bureau. Population data used to adjust case and death totals came from the U.S. Census Bureau’s 2019 American Community Survey and are five-year estimates. Unemployment data is from the Bureau of Labor Statistics and is not seasonally adjusted.

These are all the counties in Oregon where COVID-19 is slowing (and where it’s still getting worse).

Rank in MSA	County	Population	New daily cases per 100,000, week ending September 16	New daily cases per 100,000, week ending September 9	Cumulative cases per 100,000	Cumulative deaths per 100,000
1	Multnomah County	804,606	27.8	24.0	6,243.3	79.2
2	Washington County	589,481	29.6	25.2	5,789.7	46.1
3	Clackamas County	410,463	35.4	37.4	6,307.0	64.8
4	Clark County	473,252	42.0	44.2	7,348.1	78.8
5	Skamania County	11,753	45.0	25.7	4,883.9	25.5
6	Yamhill County	104,831	52.5	47.8	6,796.7	89.7
7	Columbia County	51,375	53.3	42.5	6,090.5	72.0

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