There were 7,574 new Covid-19 cases and 78 more fatalities recorded during the previous 24 hours, the Public Health Ministry reported on Tuesday morning.
There were 7,059 cases in the general population and 515 among prison inmates.
The number of new cases fell from 8,165 announced on Monday, when the country recorded 55 more deaths.
On Monday, 8,279 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 1,898,900 Covid-19 patients, 1,782,555 of whom have recovered to date.
Since the pandemic started early last year, there have been 1,927,763 Covid-19 cases, with 1,809,981 complete recoveries so far.
The death toll stood at 19,244 during the third wave and 19,338 since the beginning of the pandemic.
The 78 lates fatalities were aged 31 to 96 years and included two Myanmar nationals.
Bangkok recorded 11 new deaths while a further six were reported in the adjacent provinces of Samut Prakan (3) and Pathum Thani (3).
Other central plain provinces further from the capital recorded 20 more deaths - in Kanchanaburi (4), Chon Buri (4), Rayong (3), Prachuap Khiri Khan (2), Prachin Buri (2), Lop Buri (2), Saraburi (2) and Ayutthaya (1).
The Northeast had nine new fatalities - in Khon Kaen (1), Nakhon Ratchasima (1), Buri Ram (1), Maha Sarakham (1), Mukdahan (1), Yasothon (1), Amnat Charoen (1), Udon Thani (1) and Ubon Ratchathani (1).
The South reported 21 more deaths – in Pattani (7), Surat Thani (5), Trang (3), Yala (2), Nakhon Si Thammarat (2), Chumphon (1) and Phangnga (1).
The North saw 11 fatalities – in Nakhon Sawan (5), Mae Hong Son (2), Tak (2), Chiang Rai (1) and Phetchabun (1).
The 7,574 new cases included 7,049 local infections and 10 imported cases.
Of the local infections, 6,793 were confirmed at hospitals and 256 via mass testing.
Bangkok had 789 new cases, followed by 631 in Pattani, 407 in Nakhon Si Thammarat, 401 in Songkhla, 298 in Trang, 271 in Chiang Mai, 264 in Chon Buri, 211 in Narathiwat, 200 in Phatthalung and 187 in Samut Prakan.
Greater Bangkok reported 1,184 new cases and 17 new deaths. Four southern border provinces had 1,428 new cases and nine new fatalities, while 67 other provinces recorded 4,437 new cases and 50 new deaths.
The 10 imported cases were from Sweden (1), Bangladesh (1), the United States (2), Czech Republic (1), Cambodia (1) and Myanmar (4).
On Monday 98,444 people received Covid-19 treatment at hospitals (down from 99,227), including 2,219 seriously ill patients (down from 2,221) and 473 dependent on ventilators (down from 494).
Global Covid-19 cases rose by 341,534 in 24 hours to 247.86 million. The worldwide death toll went up by 4,978 to 5.02 million.
The US had the most cases at 46.93 million, up 47,147, and the most deaths at 767,395, up 537.
