Population Demographics
As of 2025 the population of Plattsburgh is 19,027. The population is expected to shrink to 18,776 by 2030 - a growth rate of -0.27%.
The median age of Plattsburgh residents is 36.
The diversity index of Plattsburgh is 38.7, meaning that there is a 39% chance that any two people selected out of 100 residents will be of different race or ethnicity from one another.