Most Efficient Provinces in Thailand by Revenue per Company 2026

Rayong does, at about 97.5 million baht of revenue for every registered company, the highest figure among provinces with at least 10,000 companies as of 2 July 2026 (DBD, 2026). Phra Nakhon Si Ayutthaya comes second at about 73.2 million. Then comes the surprise. Bangkok holds 812,799 companies, more than any other province by far. Yet it produces only about 58.0 million baht of revenue per company, which ranks it third. Count companies and Bangkok wins in a walk. Measure the money each company makes and two industrial provinces of the east and central plains pull ahead of the capital. The gap is not small either. A typical Rayong company generates about 68 percent more revenue than a typical Bangkok company. That is the difference between where owners choose to register a firm and where heavy value actually gets created.

One province stands apart for a specific reason. Rayong hosts the Map Ta Phut complex, the center of Thai petrochemicals and oil refining, so a handful of very large plants book enormous revenue against a modest count of 33,083 companies. That mix lifts the provincial average far above what a normal trading or service firm there would earn. The pattern is not a fluke of one province though. Ayutthaya, Samut Prakan, and Samut Sakhon all sit inside the country's manufacturing belt, and all clear or approach the national average. Provincial per capita output tells the same story, with Rayong topping Thailand's gross provincial product per head on the strength of its industrial base (NESDC, 2024).

Company counts flatter the capital, and most league tables use them. Bangkok holds about 812,799 registered companies, so almost every ranking built on headcount puts it first and stops there. Revenue per company tells a different and more useful story for anyone deciding where to build. It says that a baht of registered activity is densest around industrial clusters, not around the head offices where firms file their paperwork. For an investor scouting a site, the efficient provinces are the ones where output per firm is high, which points east and to the central plains rather than to the crowded capital. For a policymaker, the same number is a warning about concentration, since so much of the nation's revenue leans on a few heavy industry provinces. The headline is simple. Rayong makes the most money per company in Thailand, and it is not close.