To share your YouTube TV account with people living in other locations or zip codes, you will need to hide the actual location of the person who has a zip code outside of America. For this, a VPN service, like ExpressVPN, is the most suitable option. It will replace your or other users’ current IP address with a US-based IP address.
However, doing so will be more difficult with YouTube TV than with other streaming services. It is because the YouTube TV app requires location services of your device. Also, it requires users to verify their location on a mobile device to access locale content.