In his memoir Always Cedar Point, Cedar Point's former GM H. John Hildebrandt explains how Cedar Fair first began collecting zip codes of its guests in, I think, the late 90s or early 2000s. Hildebrandt was also CP's director of marketing before becoming GM, and his book makes it very clear that not only did CP gather every possible bit of information about its guests' demographics, but it made doing so a top priority. I'm sure the same is true for the rest of Cedar Fair - and the rest of the industry.
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