San Carlos Population

1930–2026

28,922

2026 projection

5.9% since 2020 (decrease)

05K10K15K20K25K30K35K19401960198020002020

Source: U.S. Census Bureau decennial counts and annual estimates, including 2010–2020 intercensal estimates. 2026 is a projection. Values between recorded years are interpolated.

Use the left and right arrow keys to inspect population observations.

Population by year

Population estimates for San Carlos. Annual change is shown as a percentage. Growth is the total change since the preceding observation.
202628,922-3391.16%
202529,261-330.11%
202429,294+1220.42%
202329,172-690.24%
202229,241-4041.36%
202129,645-1,0773.51%
202030,722+930.30%
201930,629+1890.62%
201830,440+230.08%
201730,417+600.20%

Showing 10 of 25 years.

The 2020 row compares the April 1 Census count with the July 1, 2019 estimate (about nine months). Its Growth and Annual change therefore do not represent a full year.

Growth since 2020, compared

San Carlos has a population change lower than San Mateo County, California, and the U.S.

  • United States+3.1%
  • California−0.4%
  • San Mateo County−2.5%
  • San Carlos−4.5%

Change from July 1, 2020 to July 1, 2025 population estimates—not annualized growth or site projections.

Source: U.S. Census Bureau. U.S. totals are summed from the 50 states and D.C.; unavailable comparisons are omitted.

San Carlos Demographics

41.7median age

Median age

Female43.2 yrs
Male39.7 yrs

Adults

22,694
4,894 seniors (65+) · 22% of adults17,800 other adults

Sex

Female 50.7% · 15,023Male 49.3% · 14,591

Population by age

MaleFemale85+ years, male: 23085+ years, female: 38080–84 years, male: 29080–84 years, female: 29275–79 years, male: 39275–79 years, female: 59870–74 years, male: 55870–74 years, female: 61065–69 years, male: 75565–69 years, female: 78960–64 years, male: 74060–64 years, female: 96555–59 years, male: 1,01455–59 years, female: 1,29050–54 years, male: 1,13550–54 years, female: 1,31145–49 years, male: 1,05045–49 years, female: 91740–44 years, male: 1,05440–44 years, female: 1,06335–39 years, male: 1,47535–39 years, female: 1,12630–34 years, male: 68930–34 years, female: 95625–29 years, male: 73025–29 years, female: 50920–24 years, male: 70520–24 years, female: 54215–19 years, male: 92615–19 years, female: 93610–14 years, male: 1,03110–14 years, female: 8275–9 years, male: 9865–9 years, female: 1,0330–4 years, male: 8310–4 years, female: 87985+80–8475–7970–7465–6960–6455–5950–5445–4940–4435–3930–3425–2920–2415–1910–145–90–45005001K1K

Hover or tap an age group to see exact counts. Use the up and down arrow keys to inspect age groups.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S0101

Race and ethnicity

Tap a square or a group below to highlight it.

Each square is about 1% of residents (roughly 296 people).

Hispanic or Latino residents can be of any race. All other groups exclude Hispanic residents.

U.S. Census Bureau, 2024 ACS 5-year estimates · Table B03002

San Carlos Income

$237,470median household income

Median household income

$237,470

Half of households earn more, half earn less

Median earnings

$143,358

Typical yearly pay for a worker 25 or older.

Poverty rate

3.3%

About 1 in 30 residents

U.S. Census Bureau, 2024 ACS 5-year estimates · Tables S1901, S1501, S1701

San Carlos Marital Status

62% of residents age 15 and older are married.

MarriedNever married
Overall
Male
Female
Marital status of residents age 15 and older
StatusOverallMaleFemale
Married62%63%60%
Never married25%28%22%
Divorced8%7%10%
Widowed4%1%7%
Separated1%1%<1%

U.S. Census Bureau, 2024 ACS 5-year estimates · Table S1201

Sources

14 sources

Population

American Community Survey, 2024 5-year

Additional sources