Lost River, ID Profile: Facts, Map & Data


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Lost River, Idaho - Basic Facts

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The City of Lost River had a population of 55 as of July 1, 2017. Lost River ranks in the lower quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Idaho. See peer rankings below.

The primary coordinate point for Lost River is located at latitude 43.6888 and longitude -113.6316 in Custer County. The formal boundaries for the City of Lost River (see map below) encompass a land area of 7.89 sq. miles and a water area of 0.01 sq. miles. Custer County is in the Mountain time zone (GMT -7). The elevation is 6,174 feet.

The City of Lost River (GNIS ID: 2410881) has a C9 Census Class Code which indicates an inactive or nonfunctioning incorporated place. It also has a Functional Status Code of "I" which identifies an inactive governmental unit that has the power to provide primary special-purpose functions .

Idaho is one of 20 states where Census County Divisions (CCDs) are used for statistical tracking of subdivisions within each county. The City of Lost River is located within Mackay Division of Custer County.

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

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City of Lost River, ID Boundary Map

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Boundary Maps: Mackay Division | Custer County | Idaho Counties

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Lost River, ID Data & Demographics (As of July 1, 2017)


Total Population 55
Daytime Population: Workers 5
Daytime Population: Residents 26
Total Daytime Population (TDP) 31
Ratio TDP/Total Population1 0.56
Population in Households 55
Population in Familes 43
Population in Group Qrtrs 0
Population Density2 7
Diversity Index3 17


Median Household Income $45,195
Average Household Income $58,140
Per Capita Income $24,250


Total Housing Units 26 (100%)
Owner Occupied HU 8 (30.8%)
Renter Occupied HU 3 (11.5%)
Vacant Housing Units 15 (57.7%)
Median Home Value $162,500
Average Home Value $172,222


Total Households 11
Average Household Size 5.0
Family Households 7
Average Family Size 6
  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 -0.96% -1.12%
Households -1.19% 0.0%
Families -1.82% 0.0%
Median Household Income   0.0%
Per Capita Income   1.62%

Lost River, ID - Peer Comparisons by Rank and Percentile

The table below compares Lost River to the other 227 incorporated cities, towns and CDPs in Idaho 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 # 215 6th
Population Density # 226 1st
Diversity Index # 169 26th
Median Household Income # 92 60th
Per Capita Income # 66 71st

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

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