Population Demographics
As of 2025 the population of O'Donnell is 696. The population is expected to shrink to 692 by 2030 - a growth rate of -0.12%.
The median age of O'Donnell residents is 41.
The diversity index of O'Donnell is 71.7, meaning that there is a 72% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.