Alto vs San Geronimo

A side-by-side comparison of Alto and San Geronimo: population, income, housing, and more.

Alto and San Geronimo are places in California. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Alto has the higher population (866 vs 562 in San Geronimo). Alto has the higher median home value ($2,000,001 vs $1,220,800 in San Geronimo). Since 2019, Alto's population has grown faster (+41.7% vs +40.9%).

Population, income & housing

	Alto	San Geronimo
Population	866	562
Median age	45.4 yrs	46.4 yrs
Median household income	—	$206,375
Median home value	$2,000,001	$1,220,800
Housing units	402	195
Homeownership rate	45.7%	88.7%
Bachelor's degree or higher	66.4%	87.8%
Unemployment rate	5.9%	0.0%

Trends (ACS 5-year, 2019–2023)

	Alto	San Geronimo
Population	611 → 866 (+41.7%)	399 → 562 (+40.9%)
Median household income	$185,395 → $216,495 (+16.8%)	$112,277 → $206,375 (+83.8%)
Median home value	$2,000,001 → $2,000,001 (+0.0%)	$877,200 → $1,220,800 (+39.2%)
Median gross rent	$2,367 → $3,500 (+47.9%)	—

Alto

Population

611866

Median household income

$185,395$216,495

Median home value

$2,000,001$2,000,001

Median gross rent

$2,367$3,500

San Geronimo

Population

399562

Median household income

$112,277$206,375

Median home value

$877,200$1,220,800

Age & race/ethnicity

Age distribution (share)

	Alto	San Geronimo
Under 5	2.5%	0.0%
5 to 17	23.0%	18.9%
18 to 24	0.0%	21.5%
25 to 34	12.6%	3.9%
35 to 44	9.8%	0.0%
45 to 54	16.7%	23.8%
55 to 64	25.4%	12.1%
65 to 74	9.9%	5.3%
75 and over	0.0%	14.4%

Race & ethnicity (share)

	Alto	San Geronimo
White (non-Hispanic)	77.8%	96.1%
Black or African American	1.8%	0.0%
American Indian & Alaska Native	0.0%	0.0%
Asian	9.2%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.0%
Two or more races	0.0%	0.0%
Hispanic or Latino	11.1%	3.9%

Educational attainment (age 25+)

Share of adults 25+

	Alto	San Geronimo
No high school diploma	0.0%	0.0%
High school graduate	16.9%	0.0%
Some college or associate's	16.7%	12.2%
Bachelor's degree	20.5%	9.9%
Graduate or professional degree	45.9%	77.9%

Commute to work

How workers get to work (share)

	Alto	San Geronimo
Drove alone	90.0%	76.4%
Carpooled	0.0%	0.0%
Public transit	0.0%	0.0%
Walked	0.0%	4.7%
Bicycle	0.0%	0.0%
Worked from home	10.0%	18.9%
Other means	0.0%	0.0%

Housing

Units in structure (share)

	Alto	San Geronimo
1-unit, detached	56.7%	82.6%
1-unit, attached	0.0%	17.4%
2 to 4 units	12.9%	0.0%
5 to 19 units	30.3%	0.0%
20 or more units	0.0%	0.0%
Mobile home & other	0.0%	0.0%

Poverty & households

	Alto	San Geronimo
Poverty rate	4.2%	0.0%
Average household size	2.21	2.87
Mean commute (minutes)	16	18
Median year structure built	1956	1977