Police from the Counter Corruption Division (CCD) raided two gambling dens in Pathum Thani and Samut Prakan provinces and arrested 85 suspects on Friday night.
In Lam Luk Ka district, Pathum Thani, CDD officers searched an unregistered house inside Nana Charoen market on Samafakram road, after investigators discovered that the house was used by a gambling network.
Forty-two people - 12 men and 30 women, were arrested for gambling.
Police seized 112,700 baht in assets and gambling equipment.
In Samut Prakan, officers raided a house in Bang Sao Thong district and rounded up 43 gamblers - 17 men and 26 women. Three of the women were illegal migrant workers.
Police also seized 49,300 baht in cash, betting slips, a security camera system and gambling equipment.
The suspects were initially charged with gambling and violating a gathering ban, while the illegal migrants were handed over to police for legal proceedings, pending deportation.
