Offer market research reports on a consumer goods. Reports include information on consumer preferences.
The site also includes a section on consumers (note link in top navigational bar) which may prove useful for this project.
Sample searches (search box in upper right):
Popcorn and United States
Salty Snacks and United States

Includes the following reports that offer consumer info:
*Salty Snacks - US - January 2015 (the consumer chapter/section of this report offers data on "Household purchase of salty snacks, by generations, October 2014" and "Household purchase of salty snacks, by presence of children in household, October 2014". See other sections for additional consumer data)
*The Snacking Occasion - US - February 2014 includes info on Types of Snacks Consumed, Snacks Eaten Between Meals, see the appendix for additional consumer tables.

Offers a variety of charts on popcorn including: "Number of people living in households that used pretzels, chips or popcorn in the last 7 days in the United States (USA) from autumn 2013 to spring 2015 (in millions)"

Includes a variety of reports that may prove useful for the popcorn project:
*Food Industry Conference Presentation Slides: Consumer Perspectives on Fats and Oils (2015)--note figure on "ready to eat popcorn"
*Gluten-Free Foods in the U.S., 5th Edition (2015)
*Salty Snacks (note 2013 publication year)
this site also includes reports on demographic buying habits such as Millenials, Baby Boomers, Gen X...

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SimplyMap is a web-based mapping application that lets users quickly create professional-quality thematic maps and reports using demographic, business, and marketing data for the United States. NB: 5 concurrent user limit.