Updated at 4:35 p.m. to include data from Denton and Collin counties.
Dallas County health officials reported 572 new cases Monday, breaking the county's record for cases reported in a day.
One additional death was also reported. He was an Irving man in his 40s.
More than half of all cases reported in the county after June 1 have been in the 18 to 39 age group, health officials said.
The higher case numbers being reported are associated with "multiple large recreational and social gatherings," Dallas County health officials said.
Of cases that have required hospitalization, more than two-thirds have been for people under the age of 65 and about half of them do not have any high-risk chronic health conditions.
Tarrant County health officials reported 263 new cases Monday, bringing the county total to 11,739 since tracking began in March.
There are 388 people hospitalized in the county for COVID-19.
No additional deaths were reported.
On Sunday, Tarrant County reported 393 new cases and one death.
Denton County health officials reported 70 new positive cases of COVID-19, bringing the county total to 2,740 since testing began in March.
Of the new cases, four of them are residents of long-term care facilities.
There have been 37 deaths in the county.
State health officials reported 119 new cases of COVID-19 in Collin County Monday.
The county's 42nd death was a 91-year-old Plano woman who had underlying health conditions. She was a resident at Arbor Hills Memory Care.
There have been 2,882 cases in the county since tracking began in March.
The county has 693 active cases and 127 people are hospitalized for the virus.
There have been 42 deaths in the county.
State health officials reported 4,283 new cases across the state on Monday. There have been 153,011 cases and 2,403 deaths.
