San Geronimo, CA Profile: Facts, Map & Data


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San Geronimo, California - Basic Facts

The San Geronimo Census Designated Place had a population of 463 as of July 1, 2017. San Geronimo ranks in 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 San Geronimo is located at latitude 38.0067 and longitude -122.6633 in Marin County. The formal boundaries for the San Geronimo Census Designated Place (see map below) encompass a land area of 1.51 sq. miles and a water area of 0 sq. miles. Marin County is in the Pacific time zone (GMT -8). The elevation is 302 feet.

The San Geronimo Census Designated Place (GNIS ID: 2409255) 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 San Geronimo Census Designated Place is located within Northwest Marin CCD of Marin County.

Beneath the boundary map are tables with San Geronimo 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 San Geronimo: Nicasio.

Neighborhood Data

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San Geronimo Census Designated Place, CA Boundary Map

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


Total Population 463
Daytime Population: Workers 189
Daytime Population: Residents 192
Total Daytime Population (TDP) 381
Ratio TDP/Total Population1 0.82
Population in Households 460
Population in Familes 341
Population in Group Qrtrs 3
Population Density2 307
Diversity Index3 26


Median Household Income $107,489
Average Household Income $160,351
Per Capita Income $71,535


Total Housing Units 213 (100%)
Owner Occupied HU 149 (70.0%)
Renter Occupied HU 57 (26.8%)
Vacant Housing Units 7 ( 3.3%)
Median Home Value $1,000,001
Average Home Value $1,064,262


Total Households 206
Average Household Size 2.23
Family Households 134
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 0.52% 0.56%
Households 0.48% 0.48%
Families 0.0% 0.44%
Median Household Income   1.94%
Per Capita Income   2.24%

San Geronimo, CA - Peer Comparisons by Rank and Percentile

The table below compares San Geronimo 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 # 1198 21st
Population Density # 1045 31st
Diversity Index # 1439 5th
Median Household Income # 130 91st
Per Capita Income # 74 95th

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

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