News reports from Thailand say more than 1.2 million illegal immigrants have registered with the government under an amnesty program.
Reports say more than 850,000 of the workers are from Burma, 180,000 from Laos, and the rest from Cambodia.
The registration, which began July 1 and ended Saturday, also required employers of foreign laborers to report to authorities. Upon registration, workers had to pay about $92 for a medical checkup, medical insurance and a work permit.
Those who failed to register face a jail sentence of up to three months and a ($121) fine.
Human rights groups have argued for improved working conditions for illegal migrants, since their lack of legal status exposes them to exploitation and sexual abuse.
Information for this report is provided by AP and AFP.