Is there a set up in QBO for specific county tax rates in Maryland?

Hello,

If you're talking about sales tax, here is the article on the new automated sales tax feature in QuickBooks Online.  https://quickbooks.intuit.com/community/Getting-Started/Set-up-and-use-Automated-Sales-Tax/td-p/1857...

For ALL taxes to be calculated correctly for towns and counties, often you need to make sure the full zip+4 zip code is used.  Otherwise it will only calculate the state sales tax.