With near 100% probability actually. There was a detailed report on that few years ago. Googling for "why stores ask for the zip code" brings up a lot of press

With near 100% probability actually. There was a detailed report on that few years ago. Googling for "why stores ask for the zip code" brings up a lot of press post, e.g. https://www.forbes.com/sites/adamtanner/2013/06/19/theres-a-billion-reasons-not-to-give-stores-your-zip-code-ever/ https://www.forbes.com/sites/adamtanner/2013/06/19/theres-a-...