Nicolaus is a census-designated place (CDP) in Sutter County, California.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.
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.
Nicolaus was an early major stopping point on the Feather River during the California Gold Rush.The area is unique in that it has retained its rural character yet is only 20 minutes north of Sacramento, the state capital. The economy of the Nicolaus area is driven by farming and walnut orchards and rice farming, predominate. The town of Nicolaus is the site of an annual Labor Day parade which attracts visitors from throughout the state.