Twain, CA Profile: Facts, Map & Data


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Twain, California - Basic Facts

Real Estate Resources

The Twain Census Designated Place had a population of 72 as of July 1, 2017. Twain ranks in the lower quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in California. See peer rankings below.

The primary coordinate point for Twain is located at latitude 40.0355 and longitude -121.0404 in Plumas County. The formal boundaries for the Twain Census Designated Place (see map below) encompass a land area of 7.19 sq. miles and a water area of 0 sq. miles. Plumas County is in the Pacific time zone (GMT -8). The elevation is 2,854 feet.

The Twain Census Designated Place (GNIS ID: 2409369) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

California is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The Twain Census Designated Place is located within Feather River Canyon CCD of Plumas County.

Beneath the boundary map are tables with Twain population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Twain: Grays Flat, Halstead Flat, Halsted Flat.

Neighborhood Data

Address Based Hyperlocal Data Input an address and get data & demographics for the pertinent census block group (CBG), a searchable map and a customized directory. The CBG is the smallest geographical unit used by the Census Bureau for reporting certain data.


Twain Census Designated Place, CA Boundary Map

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Boundary Maps: Feather River Canyon CCD | Plumas County | California Counties

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Twain, CA Data & Demographics (As of July 1, 2017)


Total Population 72
Daytime Population: Workers 4
Daytime Population: Residents 33
Total Daytime Population (TDP) 37
Ratio TDP/Total Population1 0.51
Population in Households 72
Population in Familes 52
Population in Group Qrtrs 0
Population Density2 10
Diversity Index3 31


Median Household Income $50,000
Average Household Income $71,214
Per Capita Income $36,219


Total Housing Units 57 (100%)
Owner Occupied HU 24 (42.1%)
Renter Occupied HU 12 (21.1%)
Vacant Housing Units 22 (38.6%)
Median Home Value $175,000
Average Home Value $192,708


Total Households 35
Average Household Size 2.06
Family Households 20
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population -1.78% -1.43%
Households -1.82% -1.17%
Families -3.03% -1.02%
Median Household Income   2.41%
Per Capita Income   2.12%

Twain, CA - Peer Comparisons by Rank and Percentile

The table below compares Twain to the other 1,516 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 1445 5th
Population Density # 1488 2nd
Diversity Index # 1382 9th
Median Household Income # 949 38th
Per Capita Income # 464 69th

Additional comparisons and rankings can be made with a VERY EASY TO USE California Census Data Comparison Tool.

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