Population Demographics
As of 2026 the population of Cottage Grove is 45,338. The population is expected to grow to 48,855 by 2031 - a growth rate of 1.51%.
The median age of Cottage Grove residents is 38.
The diversity index of Cottage Grove is 53.4, meaning that there is a 53% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.

