We have a reporting app called Better Reports, with a flexible custom reporting functionality.
I could build some custom reports for you to break down tax in various way, such as at the country, state or city level. It's very flexibile, so we can pretty much break it down however you like.
Feel free to reach out to me directly at email@example.com to discuss further.
Data Export can summarise the tax data by country, state or province. You also have an option to drill down to the order and product detail.
Let me know if you have any questions. I'm available at firstname.lastname@example.org