Current clubs:
Northern Regions: Chattrakan City | Chiangmai | Chiangrai City3 | Kamphaengphet1, 3 | Khelang United | Maejo United3 | Nakhonsawan Seekhwae City3 | Northern Nakhonmaesot United | Phitsanulok3 | Phitsanulok Unity3 | Uttaradit3
Northeastern Regions: Khon Kaen1 | Khon Kaen Mordindang4 | Muang Loei United4 | Rasisalai United | Roi Et PB United | Suranaree Black Cat | Surin City4 | Surin Khong Chee Mool4 | Ubon Kruanapat1, 4 | Udon United4 | Yasothon4
Central Regions: Angthong6 | AUU Inter Bangkok2, 8 | Chamchuri United2, 8 | Dome | KBU2, 8 | Lopburi City | NBU8 | Prime Bangkok8 | PTU Pathumthani6 | Royal Thai Air Force8 | Saraburi United6
Eastern Regions: ACDC5 | Bankhai United5 | BFB Pattaya City | Chachoengsao Hi-Tek1, 5 | Customs United2 | Fleet | Marines5 | Navy | Padriew City | Pluakdaeng United5 | Saimit Kabin United5 | Samut Prakan8
Western Regions: Assumption United6 | Hua Hin City6 | Kanchanaburi City | Maraleina6 | Nonthaburi United8 | Rajpracha2, 6 | Royal Thai Army2, 8 | Samutsakhon City | Samut Songkhram City | Thap Luang United | Thonburi United8 | VRN Muangnont8
Southern Regions: Krabi7 | Muang Trang United | Nara United2, 7 | Pattani7 | Phatthalung7 | Phuket Andaman7 | PSU Suratthani City7 | Ranong United2 | Satun7 | Songkhla7 | Yala7 | Yala City
Former clubs:
Ongoing: Amnat United1 | Ayutthaya United1 | Banbueng2, 5 | Bang Pa-in Ayutthaya1, 6 | Bangkok8 | Chainat United | Chanthaburi5 | Chanthaburi United5 | Chiangmai United | Chiangrai Lanna3 | Grakcu Sai-Mai United8 | Hi-Tech Chaiyaphum United4 | Kalasin1 | Kanchanaburi Power6 | Khon Kaen United | Kongkrailas United | Krung Thonburi2 | Lamphun Warrior1, 3 | Mahasarakham SBT4 | Mueang Kon D United | Nakhon Pathom United | Nakhon Ratchasima United4 | Nakhon Si United2, 7 | Nan3 | Northern Tak United3 | Pattaya United5 | Phayao1 | Phrae United1 | Prachinburi City | Royal Thai Fleet5 | RSU | Sakaeo1, 5 | Sakon Nakhon4 | Samutsakhon2 | Samutsongkhram6 | Siam8 | Singburi Bangrajun1 | Sisaket United | Surat Thani2, 7 | Thawiwatthana Samutsakhon United6 | Trang2, 7 | Udon Thani1 | Uthaithani | Young Singh Hatyai United
Dissolved: MH Nakhonsi City | Muangkan United6 | Rongseemaechaithanachotiwat Phayao | Simork2 | Sisaket
Related:
Thai League 2 | Thailand Semi-pro League | Thailand Amateur League | Thai FA Cup | Thai League Cup | Thai League 3 Cup
Notes
| 1 |
Original 2016 clubs in Upper Region
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| 2 |
Original 2016 clubs in Lower Region
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| 3 |
Original 2020-21 clubs in Northern Region
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| 4 |
Original 2020-21 clubs in North Eastern Region
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| 5 |
Original 2020-21 clubs in Eastern Region
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| 6 |
Original 2020-21 clubs in Western Region
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| 7 |
Original 2020-21 clubs in Southern Region
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| 8 |
Original 2020-21 clubs in Bangkok Metropolitan (Central) Region
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