Merrimac (formerly, Merrimack, Pea Vine, and Peavine) is an unincorporated community in Butte County, California located along Oroville-Quincy Road about 2.1 miles (3.4 km) south of the Plumas County line. It lies at an elevation of 3999 feet (1219 m). While the location is shown as official in the National Geographic Names Database, it is not known if locals use this name to describe the place today. Nearby is Rogers Cow Camp, a campground in Lassen National Forest. The USGS feature ID for this populated place is 1659117. The US Postal Service does not show a ZIP Code for this community. The location is within area code 530.