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 neighborhoods and a large population may be particularly at-risk.

The Springfield, MA, metro area consists of Hampden County, Hampshire County, and Franklin County. In the past week, there were an average of 35.7 new coronavirus cases every day per 100,000 Springfield residents, less than the national figure. The metro area’s average daily case growth in the most recent week is an increase from the week prior, when there was an average of 27.6 daily new cases per 100,000 Springfield residents.

The spread of coronavirus depends on a variety of factors and can vary even between neighboring counties. Within the Springfield metro area, COVID-19 is growing the fastest in Hampden County. There were an average of 40.7 new cases per day per 100,000 residents in Hampden County during the past week, the most of the three counties in Springfield with available data.

Case growth in the Springfield metro area varies at the county level. In Franklin County, for example, there were an average of 19.8 new cases per day per 100,000 residents in the past week — the least of any county in Springfield and more than the case growth rate in Hampden County.

Just as Hampden County is driving the growth of COVID-19 in the Springfield area, it also has the highest incidence of cases overall. As of September 16, there were a total of 12,738.1 confirmed cases per 100,000 residents in Hampden County, the most of the three 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 Hampden County, unemployment peaked at 20.2% in June 2020. As of June 2021, the county’s unemployment rate was 7.3%.

To determine the county in every metropolitan area where COVID-19 is growing the fastest, 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 up 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 Massachusetts 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	Hampden County	467,871	40.7	34.3	12,738.1	338.6
2	Hampshire County	161,032	28.3	15.4	6,508.0	190.6
3	Franklin County	70,577	19.8	10.6	4,253.5	162.9

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