Main building of Southern State Hospital
|Area||3.4 sq mi (9 km²)|
|- land||3.4 sq mi (9 km²)|
|Density||1,519.3 /sq mi (587 /km²)|
|- summer (DST)||CDT (UTC-5)|
|Wikimedia Commons: Anna, Illinois|
Anna is a city in the U.S. state of Illinois. It is in southern tip of Illinois. Its population was 5,136 at the 2000 census. Anna is known for the Anna State Mental Hospital (now called the Choate Mental Health Care Center). Anna was a segregated sundown town a century ago.