How common is the use of iodized salt in the USA?

[Daisy and Delilah]

I'm allergic to iodine if taken internally. It's the only thing to which I am allergic. I found this out after a CT scan where I was injected with contrast dye.

I'm allergic, to any seafood of the ocean. Shellfish, etc. Too bad this is my favorite food. I eat seafood but itch like a maniac later. I take Benadryl for that. Luckily, I don't have a severe allergic reaction with seafood. It's much worse with the contrast dye. Itching, swelling, turning red, etc. I have to request that they use no contrast dye on me at all anymore. They offer a steroid prep but it's ridiculous(they want you to take 15 steroid tablets prior to having the scan) so we just do without the dye.

I remember the days of Morton's salt. We used to have nothing but iodized salt. I use sea salt now but in strict moderation. I have noticed alot of the restaurants I go to have kosher salt or sea salt on the tables now. I seriously think many of them are still using iodized salt.