Thai Business by Province: Five Provinces Hold 61% in 2026
In short
Five provinces hold 61.4 percent of Thailand's registered companies as of 2 July 2026. Bangkok alone holds 40.9 percent, the most concentrated province in the country. The top five together count 1,221,057 firms. The other 72 provinces share just 38.6 percent between them. Business in Thailand is not spread across the map. It clusters hard around the capital.
How concentrated is Thai business?
Thailand has 77 provinces. Five of them hold most of its companies. As of 2 July 2026, Bangkok, Chon Buri, Nonthaburi, Samut Prakan and Pathum Thani together register 1,221,057 firms, or 61.4 percent of the national total of 1,989,709 (DBD, 2026). The other 72 provinces divide the remaining 38.6 percent between them. Bangkok carries the count on its own. The capital holds 812,799 companies, 40.9 percent of every registered firm in the country. Four of the top five sit inside Greater Bangkok, so the cluster is really one economic region wearing five provincial names. Chon Buri is the lone outlier, and it owes its place to the Eastern Seaboard and the industrial estates strung along it.
Where the companies actually are
- Bangkok40.9%812,799
- Chon Buri6.4%127,023
- Nonthaburi5.1%102,370
- Samut Prakan4.9%97,609
- Pathum Thani4.1%81,256
- Other 72 provinces38.6%768,652
The top five provinces register more companies than the other 72 combined.
The five busiest provinces, and the rest
| Rank | Province | Companies | Share of national |
|---|---|---|---|
| 1 | Bangkok | 812,799 | 40.9% |
| 2 | Chon Buri | 127,023 | 6.4% |
| 3 | Nonthaburi | 102,370 | 5.1% |
| 4 | Samut Prakan | 97,609 | 4.9% |
| 5 | Pathum Thani | 81,256 | 4.1% |
| Top five combined | 1,221,057 | 61.4% | |
| Other 72 provinces | 768,652 | 38.6% | |
| Thailand total | 1,989,709 | 100% |
Registered company count and share of the national total by province, as of 2 Jul 2026.
Why this matters
Concentration this tight shapes everything downstream. A firm that wants customers, suppliers, skilled staff or a nearby bank branch finds all four thickest in one corner of the country. The pull is self reinforcing. Each new company registered near the capital makes the next one a little likelier to register there too. Bangkok already registers about six times as many firms as Chon Buri, the province in second place. The output side tells the same story, with the Bangkok metropolitan region producing close to half of national GDP (NESDC, 2023). For policy the number sets a hard question. Growth in the other 72 provinces will not arrive from the registry drifting on its own. It takes a real reason for a company to plant itself away from the center. For anyone selling to Thai companies the map is blunt. Three in five of them file their address in just five provinces.
Definitions
- Concentration
- The degree to which companies cluster in a few places rather than spreading evenly. High concentration means a small number of provinces hold a large share of all firms.
- CR5
- The concentration ratio of the top five. It is the combined share of the five largest provinces, here 61.4 percent of all registered companies.
- Registered juristic person
- A company or partnership formally registered with the Department of Business Development, counted here at its registered address.
- Dormant registration
- A company that remains on the register but is not currently trading. It still counts toward its province's total.
Assumptions
- Companies are counted at their registered address, which may differ from where they actually operate.
- Both active and dormant registrations are included in each provincial count.
- Province boundaries follow the standard 77 province structure used by the registry.
Methodology
Company counts are the number of registered juristic persons whose registered address falls in each province, drawn from the Department of Business Development registry as of 2 July 2026. Provinces are ranked by that count. Each share is a province's count divided by the national total of 1,989,709 registered companies, then rounded to one decimal. Counts include active and dormant registrations recorded at their registered address, which can differ from where a firm actually operates.
How we verified this
- Top five total recomputed: 812,799 + 127,023 + 102,370 + 97,609 + 81,256 = 1,221,057, matching the stated combined figure.
- Top five share recomputed: 1,221,057 divided by 1,989,709 = 0.6137, which rounds to 61.4 percent.
- Remaining provinces recomputed: 1,989,709 minus 1,221,057 = 768,652, which is 38.6 percent of the national total, and 61.4 plus 38.6 equals 100.
- Bangkok share recomputed: 812,799 divided by 1,989,709 = 0.4085, which rounds to 40.9 percent.
- Bangkok to Chon Buri ratio recomputed: 812,799 divided by 127,023 = 6.4, so Bangkok registers about six times the second province.
References
- Department of Business Development. (2026). Registered juristic persons by province. Ministry of Commerce, Thailand. https://www.dbd.go.th/
- Office of the National Economic and Social Development Council. (2023). Gross Regional and Provincial Product (GPP). Bangkok, Thailand. https://www.nesdc.go.th/en/info/gross-regional-and-provincial-product-gpp/
Frequently asked questions
Which province has the most companies in Thailand?
Bangkok, with 812,799 registered companies as of 2 July 2026, or 40.9 percent of the national total. No other province comes close.
How many provinces hold the majority of Thai companies?
Five. Bangkok, Chon Buri, Nonthaburi, Samut Prakan and Pathum Thani together hold 61.4 percent of all registered companies, more than the other 72 provinces combined.
Where are the top five provinces located?
Four sit inside Greater Bangkok, ringing the capital. Chon Buri is the exception, on the Eastern Seaboard where much of the country's heavy industry is based.
Cite this page
Chatpong L. (2026). Thai Business by Province: Five Provinces Hold 61% in 2026. Max Data Insights. https://maxdatathailand.com/insights/how-concentrated-is-thai-business-by-province-2026
Data & corrections
Download the data (CSV)Spot something off, or want to ask about the data? Email insights@maxsolutions.co.th. We publish corrections.
Written by
Chatpong L.Founder, Max Data, Max Solutions Co., Ltd.
Chatpong L. leads Max Data, a company-intelligence platform built on Thailand's official business registry. He writes about the structure of the Thai economy using primary registry data. His work covers company formation, industry concentration, and regional business activity.
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This page reports company-level and aggregate statistics only. It names no individuals and makes no claims about any person. Figures are provided for information and may be revised as source data updates.