More than 11.4 million Americans are covered by Health Savings Account (HSA)-eligible insurance plans, an increase of more than 14 percent since 2010, according to a census released this month by America's Health Insurance Plan (AHIP).

This year's survey shows that enrollment in HSA plans nearly doubled over the last three years, from 6.1 million enrollees in January 2008 to 11.4 million in January 2011. Between January 2010 and January 2011, the fastest-growing market for HSA plans was for large-group coverage, which rose by 26 percent, followed by individual market coverage, which grew by 15 percent.

Since HSAs were first authorized starting in January 2004, AHIP has been conducting the annual survey of health plans participating in the HSA health plan market. Click here to read the full report.