The Ottawa, IL Micropolitan Statistical Area,[1] as defined by the United States Census Bureau, is an area consisting of three counties in north central Illinois, anchored by the city of Ottawa.

[2] An estimate by the Census Bureau, as of July 1, 2012, placed the population at 153,182, a decrease of 1.11%, but still making it the fourth-largest micropolitan statistical area in the United States.

[2] As of the census[3] of 2000, there were 153,098 people, 60,014 households, and 41,459 families residing within the Micropolitan Area.

The racial makeup of the Area was 95.50% White, 1.23% African American, 0.18% Native American, 0.52% Asian, 0.02% Pacific Islander, 1.57% from other races, and 0.99% from two or more races.

Males had a median income of $38,628 versus $21,706 for females.