Of course, often you're trying to identify the code(s) for a specific company. In that case, use a company directory database. Here are two that make it easy to see the codes.
The Claritas 360 module in SRDS will give you a sense of consumer behavior in the Milwaukee area for both counties and DMAs (Designated Market Areas; a term defined by Nielsen).
Below the link to SRDS Media Planning Solutions, there is a link to an intro video about the Claritas 360 module.
For data about consumer behavior with far more flexibility and granularity, but national-level only, try MRI-Simmons Insight. Be aware that using the crosstab software for dataset takes some time to learn and will require more understanding of index and % down values.
Click below on "About consumer survey datasets" for more information (including videos) about using MRI-Simmons.
By the way, MRI-Simmons used to be two separate datasets, MRI and Simmons, but they merged in 2020.