Twain, CA Profile: Facts, Map & Data


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Twain, California - Basic Facts

The Twain Census Designated Place had a population of 78 as of July 1, 2015. 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.

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, 2015.

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

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, 2015)


Total Population 78
Population in Households 78
Population in Familes 56
Population in Group Qrtrs 0
Population Density1 11
Diversity Index2 29


Total Households 39
Average Household Size 2.0
Family Households 22
Average Family Size 3


Total Housing Units 57 (100%)
Owner Occupied HU 26 (45.6%)
Renter Occupied HU 13 (22.8%)
Vacant Housing Units 18 (31.6%)
Median Home Value $275,000
Average Home Value $322,222


Median Household Income $55,714
Average Household Income $71,945
Per Capita Income $36,591
  (Compound Annual Growth Rates)


2010-2015 2015-2020
Population -0.95% -0.26%
Households -0.48% -0.52%
Families -2.41% 0.0%
Median Household Income   2.01%
Per Capita Income   2.38%
1) Population Density = Total Population per square mile.
2) The Diversity Index is a scale of 0 to 100 that represents the likelyhood 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.
Based on Census 2010 counts, the Diversity Index for the United States was 60.6 and it is expected to increase to 64.8 by July 1, 2018.

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Twain, CA - Peer Comparisons by Rank and Percentile

The table below compares Twain to the other 1,523 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2015 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 # 1448 5th
Population Density1 # 1493 2nd
Diversity Index2 # 1399 8th
Median Household Income # 702 54th
Per Capita Income # 352 77th

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