A society of 39 million, and an economy to match

This is the least contested argument on the site. Nobody seriously disputes California’s size. The disagreement is about what follows from it, which is why this page spends as much time on the limits of the argument as on the numbers.

1. The output

California produced $4.3 trillion in 2025. That is roughly 14% of the entire American economy, generated by about 11.5% of its population.

Output per person is higher here than in the United States as a whole, and higher than in China or Germany. That figure matters more than the headline total, because a large economy can simply be a large population. This one is not.

Public Policy Institute of California, California’s Economy; US Census Bureau QuickFacts, Vintage 2025 estimates.

2. Against other states

The next two state economies are Texas at about 9% of national output and New York at about 8%. California is larger than either by a margin wider than the gap between second and fifth.

California is not the biggest of a cluster of big states. It sits on its own, and has for a long time.

3. Against other countries

Measured against countries rather than states, California sits in the top five economies on Earth. It has traded fourth place with Japan recently and India is projected to pass it.

That comparison gets used carelessly by people on our side of this argument. A US state is not a country, and its economy is deeply integrated with the national one. Ranking it against sovereign states is a way of conveying magnitude, not a claim that independence would leave the same economy intact. What it does establish is that California’s scale is in the range where sovereignty is unremarkable. Countries far smaller govern themselves without anyone calling it fanciful.

4. Why we write “top five” and not a number

California passed Japan for fourth place in April 2025. Japan took it back later the same year. India is projected to pass California.

A specific rank is true for about a year at a time, and a site that publishes one has to keep publishing corrections or quietly go stale. “Top five” is the claim that is still true after the next revision, so it is the claim we make.

This is a small thing, and we mention it because how a movement handles its softest number tells you how it handles the rest.

5. Thirty-nine million people

Roughly 39.4 million people live in California. More than any other state. More than Australia and New Zealand put together. Every Nordic country combined comes to about 28 million.

Scale of population matters differently from scale of output. It is what makes California a society rather than a jurisdiction: its own universities, courts, water system, energy grid, public health apparatus and civil service, all operating at a size most sovereign states never reach.

6. What California already runs

Size alone would not settle much. What makes the scale argument substantive is that California already operates the institutions a country operates, at country scale, and has for generations.

• Two public university systems, the University of California and the California State University, alongside the largest community college system in the country.
• The largest state court system in the United States, with its own supreme court and appellate structure.
• The State Water Project, one of the largest water storage and delivery systems ever built.
• Its own electricity grid operator, running a market separate from the rest of the West.
• A civil service, a public health apparatus, and an emergency management and firefighting capability larger than most national equivalents.

None of that is offered as proof that independence would work. It is offered against the specific claim that California would be starting from nothing, which is the form the objection usually takes. The institutional capacity is already built, already staffed and already operating.

7. What the scale settles

The objection this removes is the one made most often and most casually: that California is too small, too poor or too dependent for the question to be worth asking.

It is simply false, and every figure on this page is checkable. A society of 39 million producing $4.3 trillion, running its own universities, courts, water system and grid, is in the range where self-government is unremarkable. Countries far smaller govern themselves and nobody calls it fanciful.

What that clears away is the excuse for not examining the question. What remains is the actual argument, which is about representation, money, law and consent. The other five arguments.