Helmar is an unincorporated community in Kendall County, Illinois.

The community is located near Newark and Plattville and is between Illinois State Routes 71 and 47.

Due to the church's name, the community as a whole was referred to as North Prairie.

In 1894, the residents of North Prairie sought to establish a post office to serve the community.

They decided to name it Helmar, the anglicized form of Hjalmar, the Scandinavian name of early settler Andrew Anderson.