Alto, CA Profile: Facts & Data


Alto Local Links & Resources:
Resources | ALL Alto Content
Planning to visit Alto? See Local Hotels

Also See Mill Valley, CA: ZIP Codes & Maps

Alto, California - Basic Facts

The Alto CDP(1) had a population of 732 as of July 1, 2023. 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.

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.

  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 2023 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 - 2023 Demographics

Alto, CA Data & Demographics (As of July 1, 2023)


Total Population 732 (100%)
Population in Households 732 (100.0%)
Population in Families 591 (80.7%)
Population in Group Quarters1 0
Population Density 5,823
Diversity Index2 49


Median Household Income $153,571
Average Household Income $221,422
% of Income for Mortgage4 78%
Per Capita Income $87,419
Wealth Index5 235
Socioeconomic Status Index6 High (70.3)


Total HU (Housing Units) 312 (100%)
Owner Occupied HU 179 (57.4%)
Renter Occupied HU 110 (35.3%)
Vacant Housing Units 23 ( 7.4%)
Median Home Value $2,000,001
Average Home Value $1,948,464
Housing Affordability Index3 32


Total Households 289
Average Household Size 2.53
Family Households 179
Average Family Size 3.00
  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.
  6. The Socioeconomic Index ranges from zero (lowest relative status) to 100 (highest relative status). This measure quantifies disparities in social position of an area's inhabitants and is built from a broad range of demographic, housing, and socioeconomic inputs. More information on this measure can be found in Esri's SEI tutorial.


2020-2023 2023-2028
Population 0.00% -0.22%
Households -0.53% -0.21%
Families   0.00%
Median Household Income   4.06%
Per Capita Income   2.79%
Owner Occupied HU   -1.14%

Alto, CA - Peer Comparisons by Rank and Percentile

The table below compares Alto to the other 1,611 incorporated cities, towns and CDPs in California by rank and percentile using July 1, 2023 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 # 1145 29th
Population Density # 201 88th
Median Household Income # 120 93rd
Housing Affordability Index # 267 17th
Per Capita Income # 104 94th
Diversity Index # 1324 18th

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

Alto, CA - Most Popular Things to Do

Also See: Nearby Hotels | Driving Directions

Use HTL Address Research for a California Address and get...

Boundary Maps, Demographic Data, School Zones Review maps and data for the neighborhood, city, county, ZIP Code, and school zone. July 1, 2023, data includes home values, household income, percentage of homes owned, rented or vacant, etc.

Quick & Easy Ways to...

  1. Get Current Demographic Data for Cities, Towns, and ZIP Codes
  2. View Boundary Maps, for Cities, Towns, and ZIP Codes
  3. Locate Physical, Cultural, and Historical Features

California Census Data Comparison Tool

Compare California July 1, 2023 Data
Highest or Lowest: