wrong location

Many networks, notably cellular phone networks, carry internet traffic on their own "wires" to a central location and hand off-net traffic to the public internet at certain gateway nodes. It is quite likely that your carrier took your request and handed it off to Apple in Seattle. The most important thing to remember here is that you can account for every event and action that occurred yesterday. I would not worry about this.

Of course, should you get that "Someone is trying to log in to your Apple ID from..." pop-up when you are not expecting it, you should reject the request and change your Apple ID password.

For the original poster: if it's in the same country and close in time to some change you made, you're fine.

Do enable two-factor authentication on your Apple ID, if that's not already enabled, as that increases the difficulty of re-using exposed or phished credentials.

For Schichimi: I am well aware of IP routing and of the "fun" that can arise with BGP when it's working and when it's leaking, and of the disincentives for and costs of improved geolocation accuracy. And you're quite correct that the presenting IP address for the carrier is what is showing up here in somebody's geolocation database, and which could potentially be a carrier NAT gateway, or where the device IPv6 block was geolocated, or otherwise.

IP addresses are arguably considered “correct” if they’re in the same country. It is more effort and more work and more cost to make the IP addresses geolocate better, and the more accurate the geolocation becomes, the more likely there’ll be harassment, theft, injuries, and worse.