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Hongjian Yu, PhD, Ying-Ying Meng, DrPH, Carolyn A. Mendez-Luck, PhD, Mona Jhawar, MPH and Steven P. Wallace, PhD

The authors are with the Center for Health Policy Research, University of California, Los Angeles.

Correspondence: Requests for reprints should be sent to Hongjian Yu, PhD, UCLA Center for Health Policy Research, 10960 Wilshire Blvd, Suite 1550, Los Angeles, CA 90024 (e-mail: hyu{at}ucla.edu).

Objectives. To aid state and local policymakers, program planners, and community advocates, we created estimates of the percentage of the population lacking health insurance in small geographic areas of California.

Methods.Finally, calibration ensured the consistency and stability of the estimates when they were aggregated.

Results. Health insurance coverage among nonelderly persons varied widely across assembly districts, from 10% to 44%. The utility of local-level estimates was most apparent when the variations in subcounty uninsured rates in Los Angeles County (19%–44%) were examined.

Conclusions. Stable and useful estimates of health insurance rates for small areas such as legislative districts can be created through use of multiple sources of publicly available data.