The 11,500 uninsured people in Marin will be eligible to enroll in California’s new health insurance exchange on Oct. 1 as a result of the Affordable Care Act, and some may be able to obtain free insurance through the expansion of Medi-Cal. Exchange enrollees can choose from four plans with varying levels of coverage, which will take effect at the beginning of next year. Marin residents can apply at coveredca.com, by calling (800) 300.1506 or by visiting the Marin Health and Human Services Point Reyes office. Nineteen percent of people living in Inverness or Olema are uninsured, as are over 16 percent of those living in Tomales, Point Reyes Station or Nicasio. “[People who enroll in the exchanges] will have more access to care and a lot less fear in seeking medical care,” said Steve Siegel, the executive director of the Coastal Health Alliance, which is offering presentations during the San Geronimo Health Fair, from 1 to 5 p.m. on Oct. 3; at the Dance Palace from 6 to 8 p.m. on Oct. 8; on KWMR’s Epicenter, from 5:30 to 6:30 p.m. on Oct. 9; during a flu clinic at the Dance Palace from 1 to 6 p.m. on Oct. 10; during the Bolinas Food Festival from 11 a.m. to 5 p.m. on Oct. 12; at the Tomales Farm and Flea Market from 9 a.m. to 3 p.m. on Oct. 13; at the Bolinas Community Center from noon to 2 p.m. on Oct. 17; at the Tomales Town Hall from 2:30 to 5:30 p.m. on Oct. 22; and at the Stinson Beach Firehouse from noon to 1 p.m. on Oct. 26.