English Grammar Rule: Pronunciation of Illinois
The final S in the state of Illinois is silent. The ending sound should rhyme with boy, toy, soy. The state’s final syllable should NOT rhyme with noise. And for those trivia buffs out there: Illinois was a tribe of Native American Indians. They were known as Illinois or Illiniwek Indians who occupied a large portion of the Mississippi River valley. They were indispensable allies of French fur traders and colonists who came to live in the area now known as the Midwestern United States.