Johnson County, Iowa, home to Iowa City and the University of Iowa where classes began last Monday, saw the biggest jump in new cases—up from an average of 17 per day two weeks ago to 184 per day in the week ending Aug. 30. After the reports of fast-rising cases and publication by the local media of photos of mask-less students teeming Iowa City’s bars last week, Iowa governor Kim Reynolds ordered all bars, night clubs, and other drinking venues in six counties—including those where Iowa, Iowa State, and Drake Universities are located—to close. (All three of those institutions are in counties that are among the 16 with the biggest increase in new coronavirus cases). The University of Iowa Health Care reported positivity rates well above 30% for multiple days last week.

Lee County, Alabama, where Auburn University is located—and where classes began Aug. 17—experienced the second largest increase in new cases—up from an average of 8 per day two weeks ago to 54 per day in the week ending Aug. 30. Sixteen players on the college’s football team are among those to have reportedly tested positive.

In total, counties with 113 colleges had reported at least 25 more coronavirus cases per day in the week ending Aug. 30 than two weeks prior.

In less populated areas, the return of students to campus has had an even greater impact in terms of overall coronavirus case numbers. The city of Radford, Virginia—the location of Radford University and roughly 9,400 students—had recorded just 68 cases as of Aug. 17; two weeks later, with students back on campus, the figure has increased by 465% to 348 cases for the year. The total number of cases reported year-to-date in Dawes County, Nebraska (population 8,700) have increased 329% in the two weeks ending Aug. 30. That’s the location of Chadron State College, a 3,000-student institution that has reported 27 positive cases among its student and faculty since Aug. 12. Whitman County, Washington has seen its case numbers soar by 258% in the past two weeks, reportedly due to the area’s student population. While the university has gone to remote classes this fall, many students have reportedly returned to off-campus housing nearby. Some of South Dakota’s college towns have also become hotspots, though case numbers remain relatively small.

Institutions in counties with largest increase of daily new cases

Additional new cases per day based on a seven-day average, Aug 17 – Aug. 30