Of the new cases confirmed on Sunday, 724 were in the densely populated southern coal-mining region of Silesia.
Meanwhile, 596 new infections were reported in the central region of Mazowieckie, which includes the national capital Warsaw.
The southern province of Małopolskie, which is home to Poland's second-largest city of Kraków, had the third-highest number of new infections confirmed by officials on Sunday, at 478.
The latest deaths in Poland’s coronavirus outbreak are 109 people with pre-existing medical conditions and 35 who died directly because of COVID-19, the Polish health ministry said.
On Saturday, Poland confirmed 423 deaths and 6,469 new coronavirus infections nationwide, compared with 429 deaths and 6,796 fresh cases a day earlier.
On April 8, the country reported its highest daily toll of 954 deaths related to the coronavirus.
On April 1, the Polish health ministry confirmed 35,251 new single-day cases, the most since the pandemic hit the country more than a year ago.
Poland's first case of coronavirus infection was reported on March 4, 2020.
21,209 in hospitals, 166,019 quarantined
The health ministry announced on Sunday morning that 21,209 COVID-19 patients were in hospitals nationwide, 2,652 of them on ventilators, with a further 166,019 people quarantined for possible coronavirus exposure.
Meanwhile, 2,520,968 people have now recovered from COVID-19 throughout the country, including 10,110 over the last 24 hours, the health ministry also said.
Source: IAR, PAP