The Supreme Court could decide this month that the financial help 6.4 million Americans receive to cover their health insurance costs are illegal — sending premium costs skyrocketing as much as 650 percent in states with some of the poorest residents.

The case, King v. Burwell, would affect people in the 36 different states that use Healthcare.gov as their marketplace. But the pain won’t be felt equally, according to a new graphic from the Kaiser Family Foundation, a health-care nonprofit with a wealth of data. The real losers in a ruling against Obamacare: the states that have the most people enrolled under the law and where incomes are low.