Alto, CA Profile: Facts & Data


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Alto, California - Basic Facts

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The Alto CDP(1) had a population of 728 as of July 1, 2021. Alto ranks in the upper quartile for Population Density and the lower quartile for 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 Alto is located at latitude 37.9044 and longitude -122.5255 in Marin County. The formal boundaries for the Alto Census Designated Place encompass a land area of 0.13 sq. miles and a water area of 0 sq. miles. Marin County is in the Pacific time zone (GMT -8). The elevation is 16 feet.

The Alto Census Designated Place 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 Alto Census Designated Place is located within Southeast Marin CCD of Marin County.

Alternate Unofficial Names for Alto: Blithedale.

  1. A Census Designated Place (CDP) is a statistical counterpart to a self-governing (incorporated) place such as a city, town, or village. A CDP is not a legal entity and has no governmental functions.

Jump to... (On This Page!)
  1. Alto 2021 Demographic Data
  2. Growth Rates for Alto (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. California Research Tools (Easy Tools & Current Data)
  3. California Data Comparison Tool - 2021 Demographics

Alto, CA Data & Demographics (As of July 1, 2021)


Total Population 728 (100%)
Population in Households 728 (100.0%)
Population in Families 595 (81.7%)
Population in Group Quarters1 0
Population Density 5,792
Diversity Index2 39


Median Household Income $150,000
Average Household Income $202,081
% of Income for Mortgage4 56%
Per Capita Income $81,455
Wealth Index5 280


Total HU (Housing Units) 318 (100%)
Owner Occupied HU 212 (66.7%)
Renter Occupied HU 91 (28.6%)
Vacant Housing Units 15 ( 4.7%)
Median Home Value $2,000,001
Average Home Value $1,806,014
Housing Affordability Index3 48


Total Households 303
Average Household Size 2.4
Family Households 201
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2021 2021-2026
Population 0.21% 0.25%
Households 0.18% 0.2%
Families 0.99% 0.1%
Median Household Income   0.45%
Per Capita Income   0.83%
Owner Occupied HU   0.28%

Alto, CA - Peer Comparisons by Rank and Percentile

The table below compares Alto to the other 1,521 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2021 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 # 1115 27th
Population Density # 194 87th
Median Household Income # 82 95th
Housing Affordability Index # 241 16th
Per Capita Income # 74 95th
Diversity Index # 1262 17th

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

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