Population Demographics
As of 2025 the population of Glen Ullin is 764. The population is expected to grow to 775 by 2030 - a growth rate of 0.29%.
The median age of Glen Ullin residents is 51.
The diversity index of Glen Ullin is 13.4, meaning that there is a 13% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.