I have been routinely dealing with these with my previous gig in WA. It's worse when places like Google (for Android sales) didn't provide full address of the b

I have been routinely dealing with these with my previous gig in WA. It's worse when places like Google (for Android sales) didn't provide full address of the buyers. (I remember they used to, but then it was down to city/state pair, I don't know how it is now...) For the most, it was possible to devise where in the county by looking at the amount of sales tax Google collected, but there were so many of edge cases. Since most of time, it was only a dozen or two sales within the state, but recurring joke was that maybe it's better off not selling to Washington State resident altogether. Like you said, if it was 50 states, it would be impossible to handle this.