Unless you tell them or they talk with other schools, they do not know at which schools you have applied, been granted interviews, or have been accepted.
Because of the AMCAS computer problems this year, some schools were asking for printed copies of the AMCAS application be sent to them instead of waiting for electronic versions. The printed copies had the list of schools on it. Some people just didn't send that page. I did but I doubt it had any impact on my application.