I want to scan SFPD ( San Francisco Police Dept.) only while I am in San Francisco. When I input the zip code, I also get surrounding cities which I do not want to get. Please help, thanks
This is normal, so things are working as designed.
You can try setting the Range to 0, which is kind of a long shot.
Your best option however is to create a Favorites List for just San Francisco PD. Then when in that area, after setting the zip code, turn the full database on and just scan the Favorites List.