Three elderly women with COVID-19 died on Sunday.
The new deaths bring the death toll in Bucks County to 17.
Two of the women were in their 90s and the third was in her mid-80s, county officials said.
As the county COVID-19 case count rose to 634 with 55 new cases, 33 patients were in local hospitals and 12 in critical condition on ventilators.
Many of the new cases reported are coming from places were people live in close proximity, said Dr. David Damsker, the county health director.
Several nursing homes in the county have reported COVID-19 cases. The county correctional facility also has three officers and one inmate with COVID-19.
As of Sunday night, 86 COVID-19 patients have recovered.