This article is from the ER FAQ, by Rose Cooper email@example.com with numerous contributions by others.
"ER" is filmed both in California and in Chicago. The
hospital who`s exterior is seen on the show is the University of
Illinois Hospital at 1720 W. Taylor Street, which is part of the
University of Illinois Medical School. (This is not to be confused
with the University of Illinois at Chicago (UIC) Hospital, which
is eight blocks to the east). The U of I hospital is about a
half-mile from the real Cook County Hospital.
Other exterior location shots are filmed elsewhere in Chicago, much
to the delight of resident ER fans and enthusiasts. In an article published
earlier this year, Jefferson Graham of "USA TODAY" writes, "As always, ER will
go to Chicago four times this year to shoot street scenes, an undertaking few
dramatic shows tackle."
Sometimes, characters can be seen walking in parts of Chicago
which are actually quite a distance from where Cook County Hospital
is supposed to be; this is artistic license for the purpose of having