And took a 5% share of total US gaming revenues.
The latest research from mobile analytics firm Flurry claims that $500 million of iPhone games were sold in the US in 2009, up from $115 million in 2008.
Those figures are based on a combination of Apple's figures and Flurry's own data culled from games tracked using its analytics service.
Flurry also claims that iPhone accounted for 5% of US video game software revenues in 2009, up from 1% in 2008.
However, it also broke down revenues for the various handheld gaming platforms: PSP, DS and iPhone. In 2008, iPhone took a 5% share of the portable game software market in the US, compared to DS' 75% and PSP's 20%.
In 2009, Flurry claims iPhone rocketed to a 19% share. DS fell to 70%, but the big loser was PSP, which fell to 11%.
In a blog post, the company warns that Apple's gaming ambitions continue. "With the iPad featuring a larger screen and more processing power, games on the tablet take a step closer to PC and console gaming," it says.
"Unless the other major video game platform providers (i.e., Sony, Nintendo and Microsoft) respond accordingly, Apple could continue to roll up video game market share."