Jansen is a village in Jefferson County, Nebraska, United States.

[3] Jansen was platted in 1886 when the Chicago, Rock Island, and Pacific Railroad was extended to that point.

[5] The village was named after local rancher and politician Peter Jansen.

[6] According to the United States Census Bureau, the village has a total area of 0.23 square miles (0.60 km2), all land.

39.7% of all households were made up of individuals, and 22.4% had someone living alone who was 65 years of age or older.

There were 4.9% of families and 7.5% of the population living below the poverty line, including 2.2% of under eighteens and 18.4% of those over 64.