Nicolaus is a census-designated place (CDP) in Sutter County, California. Nicolaus is part of the Yuba City Metropolitan Statistical Area. Nicolaus sits at an elevation of 26 feet (7.9 m). The 2010 United States census reported Nicolaus's population was 211.
It is named after Nicolaus Allgeier, local rancher. The town's former names included Nicolaus Ferry, and Nicolaus' Ranche.
Nicolaus Allgeier established a ferry at what later became the town of Nicolaus in 1843 to cross the Feather River on the road between Sutter's Fort and Sutter's Hock Farm. The town was established in 1850 and has had a post office since July 28, 1851 making it one of the oldest post offices in the state.