You should probably try what one of the few online demos of IP geolocation tell about your IP... (just to cite one among many, quality varies a lot across services and geographic zones: https://www.maxmind.com/en/locate-my-ip-address)
This makes me glad I have iCloud Private Relay turned on for all of my devices and my wife’s devices. Clicking on this link showed my location as Birmingham, Alabama, more than 1000 miles away from my actual location in northern Iowa. Several of the other IP geolocation sites others have linked in this thread showed places like Chicago (closer), and Dallas (much further).
Interesting. I have a static IP, and have kept that same IP through multiple moves around the state, but it knows my current zip code. I wonder if that is because my ISP shares the zip code, or through association with data collected from other sites.
And yet every site that uses IP geolocation for useful purposes thinks I'm in a completely different state that bounces around every few months, if I don't let the browser share my location.
I work for IPinfo.io (feel free to check your location data with us to see if we are correct as well). It is most likely that your ISP is sharing your zip code via a WHOIS/geofeed record.
For me, Firefox and without iCloud Private Relay engaged, Maxmind is within about 2km and doesn't get the city correct (but we're right on a border), and IPinfo is about 15km as the crow flies (and gets the city entirely wrong).