Objective: To gain opinions from low-income, limited-English-speaking Hispanic and Asian immigrants for formative research in a social marketing campaign. Design: Nineteen questions on obesity prevention-related topics were embedded into a larger random digit-dial survey investigating the effects of language and cultural barriers on health care access. Participants were selected by ethnic encoding from consumer databases. Setting: California's northern, southern, and Central Valley regions. Participants: Nine hundred and five adult Hispanic, Chinese, Vietnamese, Hmong, and Korean Californians from households less than 130% of the Federal Poverty Level interviewed in 2005. Variables Measured: Media usage, food stamp participation, health insurance, health problems, access and availability of fruits and vegetables (FVs) and physical activity, beliefs about overweight, and related regulation and policy change. Analysis: Descriptive statistics and percentages for all questions. Results: Latinos reported receiving most information from television; Hmong from radio. Hispanics, Koreans, and Vietnamese thought diabetes was the greatest health issue in California. Among Hmong, 83% thought FVs were too expensive, and 49% of Vietnamese thought good quality, affordable fresh FVs were too hard to find. Conclusions and Implications: Identifying characteristics and opinions that distinguish these ethnic immigrant populations better enables the "Network for a Healthy California" to develop culturally relevant social marketing campaigns and materials. (Contains 8 tables.)