Population Demographics
As of 2025 the population of Pecos is 9,978. The population is expected to shrink to 9,938 by 2030 - a growth rate of -0.08%.
The median age of Pecos residents is 36.
The diversity index of Pecos is 72.1, 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.