Hamilton Branch is a census-designated place (CDP) in Plumas County, California, United States.

Hamilton Branch is located at 40°16′26″N 121°5′45″W / 40.27389°N 121.09583°W / 40.27389; -121.09583 (40.274001, -121.095899),[3] on the north-east shore of Lake Almanor.

According to the United States Census Bureau, the town has a total area of 1.1 square miles (2.8 km2), all land.

The racial makeup of Hamilton Branch was 514 (95.7%) White, 2 (0.4%) African American, 0 (0.0%) Native American, 3 (0.6%) Asian, 0 (0.0%) Pacific Islander, 3 (0.6%) from other races, and 15 (2.8%) from two or more races.

446 people (83.1% of the population) lived in owner-occupied housing units and 91 people (16.9%) lived in rental housing units.

There were 400 housing units at an average density of 371.4 per square mile (143.4/km2).

In the state legislature, Hamilton Branch is in the 1st Senate District, represented by Republican Megan Dahle,[7] and the 1st Assembly District, represented by Republican Heather Hadwick.

[8] Federally, Hamilton Branch is in California's 1st congressional district, represented by Republican Doug LaMalfa.