California has made major strides in reducing the number of state residents without health insurance coverage. With the state’s Medicaid expansion and the creation of Covered California under the Affordable Care Act (ACA), the percentage of Californians without insurance dropped nearly 5 percentage points in 2014—the first year of ACA implementation. Declines occurred across all racial and ethnic groups, with Latinos registering the largest drop at 9 percentage points. Nevertheless, Latinos continue to experience the highest uninsured rate, in part because the ACA coverage expansions exclude California’s estimated 2.7 million undocumented immigrants.
But there is more to the story of insurance coverage and California’s immigrants: we also observe large declines in the uninsured rate among all noncitizens, a group that includes an estimated 2.6 million people who are legally residing in the state (with green cards, temporary visas, work visas, etc.), as well as those who are undocumented. When we look at uninsured rates across different citizenship categories, we see the drop was larger among noncitizens than among US-born and naturalized citizens—noncitizens had nearly a nine percentage point decline in their uninsured rate.
Noncitizens who legally reside in the state have access to ACA coverage expansions either through the Medi-Cal program—if their household income is below 138 percent of the federal poverty level, about $33,500 for a family of four—or through Covered California, with financial assistance available to help pay for coverage. Still, about 35% of California’s more than five million noncitizen residents currently lack comprehensive health insurance coverage—most are likely to be undocumented, with limited sources for affordable insurance coverage.
Undocumented residents sometimes have private health insurance, most often through their employers. National estimates suggest between 30–40% of undocumented immigrants have coverage. This number could grow if federal immigration reforms are implemented, by providing undocumented immigrants who qualify (between 1.1 and 1.3 million in California) with work permits and better job opportunities that could offer increased access to employment-based insurance.
Along with pending federal action on immigration reform, state legislative proposals are also focusing on expanding affordable insurance coverage options to the undocumented. In our new report, we discuss these potential options and provide new regional estimates of the undocumented population in California by income thresholds to assist policymakers in planning for potential coverage expansions to this group.

Statewide, our preliminary estimates indicate that just over half of undocumented immigrants (51%) are likely to be under the 138% poverty threshold used for Medi-Cal income eligibility. This share varies widely across regions. Nearly 60% in Los Angeles County and the Central Valley have incomes below the 138% threshold. Most Bay Area counties have lower shares below this threshold—from 36% in Santa Clara County to 44% in Contra Costa County. These findings are generally consistent with other work that uses different methods to profile California’s undocumented immigrants (
We find that California has over 900,000 undocumented immigrants filing federal tax returns for the 2012 tax year, the most recent year data is available. These undocumented immigrants live in 55 of our 58 counties, with large numbers in Los Angeles, the Bay Area, the Sacramento region, the Central Valley, coastal California, and the Inland Empire. This information can be useful to local legal service providers and local governments to help plan for the registration of eligible undocumented immigrants, the most critical first step in implementing the president’s order.
President Obama has made it clear that those eligible for deportation relief under this new executive order are ineligible for health care subsidies under the Affordable Care Act. But, as in the past, California may wish to do more—for example, providing Medi-Cal coverage to qualifying adults and doing more to reach out to their already eligible children. In addition, upward mobility is most likely for immigrants obtaining work permits if they make investments in English language acquisition. NGOs, community college districts, and school districts that still provide adult education could use the information about where undocumented immigrants live to plan course offerings in the years to come.