Ethnic groups in Lop Buri Province can be categorized into two main groups according to their origins: one from Laos and the other from southern Burma. The occupations of the ethnic groups were similar; involving farming, raising livestock, making wickerware, and weaving (each ethnic group having different methods and styles). Making bricks was exclusively for the Mon. Customs and traditions were unique to each ethnic group, and were mostly based on their religions and beliefs.

Phuan or Thai Phuan originated from Muang Phuan in the northern part of Xiang Khwang in Laos. The ethnic group was taken to Siam as prisoners of war in the reign of King Nang Klao. When King Anuwong of Laos became rebellious, Thailand sent its army to defeat the king. After having defeated the rebellious king, the Phuan ethnic group was brought into the country and settled in Lop Buri, Saraburi, Suphan Buri, and Nakhon Chaisri. In Lop Buri, they were settled in tambon Ban Sao, "Sanam Chaeng" District, which was later renamed as "Ban Mee District" (p. 1).
    
Ngaew or Lao Ngaew originated from Vientiane, Laos. The ethnic group was taken to Lop Buri together with the Phuan. They were settled on forested marsh land called Ban Nong Rao. It was later renamed "Ban Nong Muang" in Ban Mee District (p. 3).
    
Berng or Thai Berng originated from Vientiane, Laos. The ethnic group currently resides in a large group in tambon Dee Lang and tambon Phatananikhom (Nong Na). Originally, they were settled at Nong Pla Siew, about 20 kilometers from the present area. After an outbreak of cholera, they moved to tambon Dee Lang (originally Ban Elang) (p. 4).
    
The Mon or Raman or Taleng originated from southern Burma and first migrated to Thailand in 1584. The ethnic group migrated to Lop Buri from Pathum Thani, Samut Prakarn, Ayuthaya, and Singburi Provinces. They originally settled at Tha Din Niaw Village, tambon Pho Sam Ton. They later moved to Bang Khu Village, currently tambon Bang Khan Mak (p. 5).