

For every 100 females age 18 and over, there were 81.1 males. For every 100 females, there were 84.2 males. There were 413 families (51.8% of households) the average family size was 2.77. 314 households (39.3%) were one person and 93 (11.7%) had someone living alone who was 65 or older. There were 63 (7.9%) unmarried opposite-sex partnerships, and 5 (0.6%) same-sex married couples or partnerships. There were 798 households, 183 (22.9%) had children under the age of 18 living in them, 300 (37.6%) were opposite-sex married couples living together, 85 (10.7%) had a female householder with no husband present, 28 (3.5%) had a male householder with no wife present. The census reported that 1,673 people (96.8% of the population) lived in households, no one lived in non-institutionalized group quarters and 55 (3.2%) were institutionalized.

The racial makeup of Quincy was 1,500 (86.8%) White, 132 people (7.6%) Hispanic or Latino of any race, 37 (2.1%) Black, 29 (1.7%) Native American, 19 (1.1%) Asian, 2 (0.1%) Pacific Islander, 66 (3.8%) from other races, and 75 (4.3%) from two or more races. The population density was 407.6 people per square mile (157.4/km 2). Source: WRCC (temperature normals 1895–2013),Īt the 2010 census Quincy had a population of 1,728. Although summer days are hot and only 1.4 days per winter fail to top 32 ☏ (0 ☌), nights can be very cold and frosts occur on 179 days per year and have been recorded even in July.

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. Cultivated land north of the residential area lies on poorly drained loam, silt loam or fine sandy loam. 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. Quincy is underlain by metasedimentary rock of the Shoo Fly Complex. He then laid out the town and named it after his ranch in Illinois. Bradley, one of the organizers of Plumas County, donated the land at Quincy for establishment of the county seat.

Quincy is named after the city of Quincy, Illinois, named in turn after John Quincy Adams (1767 - 1848), the sixth president of the United States (1825 - 1829). Elizabethtown started in 1852 and slowly dissolved and moved a mile away into American Valley to form Quincy after 1858. Quincy started as a Gold Rush community just outside Elizabethtown, CA.
