How everyone collects tax?

I'm about to release the e-commerce and I really like my current website thru squarespace. However, I am super frustrated with setting up sales tax. I've read some articles that I should manually entered sales tax percentage? I mean.. Fine, I can do all state tax for 54 states but how about local tax? How is everyone doing with this? It is simply not possible to enter all zipcode in the states (US) so I am really curious how others are doing with this.

I also saw the post that automatically calculated tax system is now available with beta integration but I don't see that option in my website unfortunately. Does anyone have any idea when this will be available for everyone? I really don't want to leave the squarespace.. (Just checked the shopify but I don't think they have the figures that I like- Mine will have e-commerce but also will carry other visual contents as well, I feel like shopify is very focused on e-commerce only).

Any tips or advice will be appreciated. 

Going through the same with a client from maheenandco.