The total population of Altmar is estimated to be 310 with 148 males (47.74%) and 162 females (52.26%). There are 14 more females than males in Altmar.
The median age in Altmar, NY is 35.3, as per 2021 ACS 5-Year Estimates. Of the total population, 20.51% were under the age of 15, 18.91% aged 15 to 29, 50.32% aged 30 to 64, 10.26% aged 65 to 84, and 0.00% were 85 years of age and older.