Machias village is located in the northeast part of the town of Machias and comprises the developed center of the town. It is bordered to the north by the community of Lime Lake. Ischua Creek, a tributary of the Allegheny River, forms the southern edge of the CDP.
According to the United States Census Bureau, the Machias CDP has a total area of 1.0 square mile (2.7 km2), of which 0.85 square miles (2.2 km2) is land and 0.15 square miles (0.4 km2), or 16.19%, is water.[2]