There were 6,901 new Covid-19 cases and 55 more fatalities recorded during the previous 24 hours, the Public Health Ministry announced on Thursday morning.
There were 6,757 cases in the general population and 144 among prison inmates.
The number of new cases rose from 6,524 announced on Wednesday, when the country recorded 56 more deaths.
On Wednesday, 7,556 Covid-19 patients were discharged from hospitals after recovering from the coronavirus.
Since April 1, when the third wave of Covid-19 began, Thailand has treated 2,015,262 Covid-19 patients, 1,905,773 of whom have recovered to date.
Since the pandemic started early last year, there have been 2,044,125 Covid-19 cases, with 1,933,199 complete recoveries so far.
The death toll stood at 20,160 during the third wave and 20,254 since the beginning of the pandemic.
The 55 new fatalities were between the ages of 39 and 99 years old and included two Myanmar nationals.
Bangkok recorded three more deaths while a further five were reported in the adjacent provinces of Nonthaburi (2), Nakhon Pathom (1), Samut Prakan (1) and Samut Sakhon (1).
Other central plain provinces further from the capital recorded 10 more deaths - in Rayong (2), Lop Buri (2), Samut Songkhram (2), Chanthaburi (1), Prachuap Khiri Khan (1), Ayutthaya (1) and Suphan Buri (1).
The Northeast had nine fatalities - in Roi Et (2), Kalasin (1), Chaiyaphum (1), Nakhon Ratchasima (1), Loei (1), Amnat Charoen (1), Udon Thani (1) and Ubon Ratchathani (1).
The South reported 16 more deaths – in Pattani (5), Songkhla (4), Nakhon Si Thammarat (3), Surat Thani (3) and Trang (1).
The North saw 12 new fatalities – in Chiang Mai (5), Phetchabun (3), Tak (2), Chiang Rai (1) and Phichit (1).
The 6,901 new cases included 6,742 local infections and 15 imported cases. Of the local infections, 6,423 were confirmed at hospitals and 319 via mass testing.
Bangkok had 878 new cases, followed by 592 in Songkhla, 365 in Nakhon Si Thammarat, 278 in Chiang Mai, 214 in Yala, 205 in Chon Buri, 201 each in Pattani and Surat Thani, 187 in Samut Prakan and 152 in Tak.
The 15 imported cases were from Singapore (1), the United States (2), the United Kingdom (1), the United Arab Emirates (1), Qatar (1), Malaysia (1), Myanmar (2) and Cambodia (6).
On Wednesday 90,672 people received Covid-19 treatment at hospitals, including 1,742 seriously ill patients and 406 dependent on ventilators.
Since the country reopened to visitors on Nov 1, 63,659 people had arrived by air and 81 of them (0.13%) were confirmed with Covid-19, as of midnight.
Global Covid-19 cases rose by 581,100 in 24 hours to 255.69 million. The worldwide death toll went up by 7,874 to 5.14 million.
The US had the most cases at 48.29 million, up 104,702, and the most deaths at 787,984, up 1,416.
