This is a guide I've written for targeting household income levels (various tiers of targeting): AdWords Targeting By Household Income Brackets (available at http://adhouseadvertising.com/more-info/articles/learn-with-us/item/58-income-level-targeting-for-google-adwords-online-advertising ) It's just a quick how-to guide. This targeting method works best for larger-scale targeting, primarily at the national or regional level. Comment on the post on here or on our site if there's a question you have that I can address in an update to the post, or answer in a new article.