In 2022, the population of Gratz was 741, a 0.54% decrease year-by-year from 2021. Previously, in 2021, Gratz's population was 745, a decline of 0.00% compared to a population of 745 in 2020.
The median age in Gratz, PA is 52.1, as per 2021 ACS 5-Year Estimates. Of the total population, 13.17% were under the age of 15, 16.87% aged 15 to 29, 55.01% aged 30 to 64, 11.39% aged 65 to 84, and 3.57% were 85 years of age and older.