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

[3] According to the United States Census Bureau, the CDP has a total area of 12.1 square miles (31 km2), all of it land.

East-Quincy is underlain by metasedimentary rock of the Shoo Fly Complex.

[4] Its dominant silica-rich clastic material weathers to a stony coarse soil which includes the well or somewhat excessively drained alluvial fan material (mainly Forgay very gravelly sandy loam) on which most of Quincy's businesses and homes have been built.

[5] East-Quincy has a Mediterranean climate (Köppen Csb) though its inland location and altitude makes it more continental and wetter than usual for this type, with very heavy snowfalls sometimes occurring in winter – the record being 133 inches (337.8 cm) in the very wet January 1916.

The racial makeup of East Quincy was 2,174 (87.3%) White, 79 (3.2%) African American, 43 (1.7%) Native American, 15 (0.6%) Asian, 0 (0.0%) Pacific Islander, 32 (1.3%) from other races, and 146 (5.9%) from two or more races.

There were 1,069 housing units at an average density of 88.5 per square mile (34.2/km2).

In the state legislature, East Quincy is a part of the 1st Senate District, represented by Republican Megan Dahle,[12] and the 1st Assembly District, represented by Republican Heather Hadwick.

[13] Federally, East Quincy is in California's 1st congressional district, represented by Republican Doug LaMalfa.