[3] Illinois Route 1 follows the western border of the village, leading north 8 miles (13 km) to St. Anne and south 10 miles (16 km) to Watseka, the Iroquois County seat.

According to the 2021 census gazetteer files, Martinton has a total area of 0.27 square miles (0.70 km2), all land.

[4] As of the 2020 census[2] there were 334 people, 142 households, and 105 families residing in the village.

There were 138 housing units at an average density of 503.65 per square mile (194.46/km2).

21.83% of all households were made up of individuals, and 6.34% had someone living alone who was 65 years of age or older.