The National Health Interview Survey (NIHS) 
A cross-sectional annual survey that collects health data (including behaviors and utilization) on every member of participating families, with additional data for one randomly selected adult and child. 

Medical Expenditure Panel Survey (MEPS)
This is a panel survey that collects two calendar years of data on every member of participating families.

National Health and Nutrition Examination Survey (NHANES)
A cross-sectional biannual study that combines interviews and physical examinations to obtain demographic, socioeconomic, dietary, and health-related (medical, dental, and physiological and lab measurements) data on US adults and children.

Behavioral Risk Factor Surveillance System (BRFSS)
An annual, cross-sectional telephone survey that collects state-specific data about US adults (18+) regarding their health-related risk behaviors, chronic health conditions, and use of preventive services.

CHIS – California Health Interview Survey
Provided by the UCLA Center for Health Policy Research, the California Department of Health Services, and the Public Health Institute, this site offers data gathered in the California Health Interview Survey, performed every two years. (Requires free registration)

DHS – Demographic and Health Surveys
This site provides data compiled by the U.S. Agency for International Development regarding health in developing nations.

ICPSR
The Interuniversity Consortium for Political and Social Research (ICPSR) provides access to an extensive collection of downloadable data. For a list of health-related datasets, visit the ICPSR Health Data guide.

IHIS – Integrated Health Interview Series
The Integrated Health Interview Series (IHIS) is a harmonized set of data and documentation based on material originally included in the public use files of the U.S. National Health Interview Survey (NHIS) and distributed for free over the Internet. IHIS variables are given consistent codes and have been thoroughly documented to facilitate cross-temporal comparisons.

Los Angeles County GIS Data Portal
The LA County GIS Data Portal is the place to search for and download GIS data created, maintained, licensed, and stored by the County of Los Angeles.

UCLA Data Archive
Established in 1977, the UCLA Data Archive maintains a collection of machine-readable data files and their documentation, coordinates the acquisition of additional data from a variety of sources, and provides access to publicly available data, including data from the Center for Health Statistics.

UC Merritt data repository
Merritt is a new cost-effective repository service from the University of California Curation Center (UC3) that lets the UC community manage, archive, and share its valuable digital content.