Photo of charts

California Health Interview Survey (CHIS)

The California Health Interview Survey (CHIS) is the nation's largest state health survey and a critical source of data on Californians, as well as on the state's various racial and ethnic groups.

What is CHIS?

Get information about the largest state health survey in the nation, including who CHIS interviews, what topics are covered, how CHIS is used, and the impact CHIS is making in California and across the nation.

Are You in the Survey?

Have you been selected to take the California Health Survey? Learn more about why your participation matters and how to get started on taking the survey.

Access CHIS Data

Free and easy-to-use online health query tools. Comprehensive public use files in SAS and STATA. Confidential data and special use research files. CHIS has a variety of data tools available for your research needs.

CHIS Design and Methods

From methodology reports and research, questionnaire and survey topics, to sample design and data quality, learn more about CHIS’ high-quality survey design and methods.

CHIS at a Glance

22,480

households interviewed for the 2023 CHIS

100+

topics covered in the 2023 CHIS

1.7 million+

queries run in AskCHIS and AskCHIS NE since launch

10 million

different CHIS estimates can be explored in AskCHIS

It becomes like the Bible. It came out of UCLA; it came out of CHIS — you know it’s reliable.

Richard Figueroa
Deputy Cabinet Secretary, Office of the Governor Gavin Newsom Former Acting Director, California Department of Health Care Services

CHIS 2024 Making an Impact

The 2024 California Health Interview Survey (CHIS) Making an Impact report shows our latest research and that of people who use our data — our funders, researchers, health departments, government agencies, journalists, nonprofit organizations, and community groups — who share a goal to make the people of California healthier and stronger.

Read the report

CHIS Training

Interested in learning how to use our online query tools AskCHIS and AskCHIS Neighborhood Edition? Visit our training website for online tutorials on various CHIS data products.

Access trainings

CHIS in Publications

Each year, the UCLA Center for Health Policy Research produces reports, policy briefs, fact sheets, and infographics using CHIS data. In addition, CHIS data are featured in peer-reviewed journal articles at prestigious journals. Take a look at some of the publications featuring CHIS.

Read publications

CHIS Making an Impact 

CHIS Making an Impact annual reports look back at the exciting work produced by CHIS.