Hello there, @cmcgrothers.
At this time, exporting sales tax rates by zip code is unavailable in QuickBooks Online (QBO).
However, you can open this article about the sales tax rate per state in QuickBooks: Find your sales tax rate for your state.
Also, you can check this article to know more about the basics of collecting sales tax: Sales tax basics.
Please know that our doors are always open to help you with any QuickBooks-related concern.