Altmar is a village located in Oswego County, in the state of New York (NY), United States. Nestled in the Middle Atlantic division of the North-east region, it covers an area of 2.2 square miles (6.0 km²) and sits at an elevation of 577 ft. With a population of approximately 351 residents, Altmar offers a peaceful, rural atmosphere.
The town's population is composed of about 48.43% males and 51.57% females, and it has a population density of 162.50 people per square mile (62.74/km²). Altmar lies at a latitude of 43.51 and a longitude of -76, operating in the UTC-5.
Locals reflect a blend of American ancestry, with roots primarily in United States (10.3%), followed by English (16.5%), German (0%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 13302.