Spring Bay is a village in Woodford County, Illinois, United States.

As of the 2010 United States census, the village population was 452, up from 436 in 2000.

The village is part of the Peoria, Illinois Metropolitan Statistical Area.

[3] As of the census[5] of 2000, there were 436 people, 173 households, and 125 families residing in the village.

The population density was 541.0 inhabitants per square mile (208.9/km2).