Beginning 1 September, we will need to geoblock Mississippi IPs

Is there even such a thing as a "Mississippi IP?"

I.E. Are US ISPs, particularly big ones like Comcast, required to geolocate ISPs to the state where the person is actually in? What about mobile ones?

Where I live (not US), it is extremely common to get an IP that Maxmind geolocates to a region far from where you actually live.

I live in Vancouver, WA and my IP comes back to Portland, OR.

Vancouver residents may as well be Oregonians anyway. Most of them are paying OR income tax. They do most of their shopping and entertainment in Oregon too.

I work for a Portland company at home in Vancouver so I get to skip their income tax. It's a 10-15 minute drive to the PDX area where there is a Best Buy, Ikea and other stores where I can easily skip sales if I want to.