In 2007-8 the mean daily intake of sodium was measured at 3266mg based on a N of 7227. We're supposed to limit it to 2300mg or less, barring health conditions like HTN which would suggest a limit more like 1500mg. Ten foods provided 44% of the salt: bread, cold cuts and cured meats, pizza, poultry, soups, sandwiches, cheese, pasta mixed dishes, meat mixed dishes, and savory snacks. Store-bought foods provided over 70% of the sodium consumed.

SOURCE
http://www.medscape.com/viewarticle/758428?src=mpnews&spon=34