Portola Valley, CA median household income trends: 2010 to 2021
From 2010 to 2021, the median household income for Portola Valley increased by $44,593 (19.76%), as per the American Community Survey estimates. In comparison, median household income for the United States increased by $4,559 (6.51%) between 2010 and 2021.
Analyzing the trend in median household income between the years 2010 and 2021, spanning 11 annual cycles, we observed that median household income, when adjusted for 2022 inflation using the Consumer Price Index retroactive series (R-CPI-U-RS), experienced growth year by year for 7 years and declined for 4 years.
The most significant year-by-year growth occured from 2015 to 2016, when the median household income increased by 55,471 (from $229,482 to $284,953). Similarly the most substantial year-by-year decline occured from 2017 to 2018, when the median household income decreased by 46,630 (from $292,863 to $246,233).
In California, among cities with populations of fewer than 5,000 residents, Portola Valley ranks 1st out of 49 for median household income. This rank highlight its position as one of the top-earning small cities within the state of California.
Median household income in Portola Valley, CA by household size
To gain deeper insights into the median household income for Portola Valley, we conducted an analysis of the most recent available data from the U.S. Census Bureau American Community Survey 5 year Estimates (the most recent data available).
Of the 7 household sizes (1 person to 7-or-more person households) reported by the census bureau, Portola Valley did not include 7-person households. Across the different household sizes in Portola Valley the mean income is $245,420, and the standard deviation is $60,768. The coefficient of variation (CV) is 24.76%. This high CV indicates high relative variability, suggesting that the incomes vary significantly across different sizes of households. Please note that the U.S. Census Bureau uses $250,001 as a JAM value to report incomes of $250,000 or more. In the case of Portola Valley, there were 5 household sizes where the JAM values were used. Thus, the numbers for the mean and standard deviation may not be entirely accurate and have a higher possibility of errors. However, to obtain an approximate estimate, we have used a value of $250,001 as the income for calculations, as reported in the datasets by the U.S. Census Bureau.
In the most recent year, 2021, The smallest household size for which the bureau reported a median household income was 1-person households, with an income of $121,378. It then further increased to $270,229 for 6-person households, the largest household size for which the bureau reported a median household income.
Portola Valley median household income by household size
The table below displays median household incomes for various household sizes, as reported by the U.S. Census Bureau. Explore how household income varies with the size of the family unit.
| Household Size | Median Household Income |
|---|---|
| 1-person households | 121,378 |
| 2-person households | 270,229 |
| 3-person households | 270,229 |
| 4-person households | 270,229 |
| 5-person households | 270,229 |
| 6-person households | 270,229 |
| 7-or-more-person households | 0 |
According to the Census Bureau data, the median household income reaches its peak among 2-person households, reaching $270,229 Please note that this income is a JAM value, as reported by the U.S. Census Bureau, and may not be entirely accurate. For your analysis, you can consider that the highest income in Portola Valley falls within the range of $250,000 or more, rather than being a specific, precise number.
Portola Valley, CA income distribution and inequality
To gain a comprehensive understanding of income distribution in Portola Valley, we conducted an analysis of quintiles data from the U.S. Census Bureau. While the bureau does not categorize income into subjective classes like lower-income, middle-class, or upper-class, they instead divide the population into five quintiles, ensuring that each quintile represents nearly the same number of households. This classification allows us to analyze income levels across a spectrum from the lowest to the highest income groups.
Mean household income by quintile in Portola Valley
The table below presents the mean household income for each of the five quintiles in Portola Valley, offering valuable insights into income distribution and inequality.
| Income Level | Mean Household Income |
|---|---|
| Lowest Quintile | 53,642 |
| Second Quintile | 152,752 |
| Third Quintile | 288,244 |
| Fourth Quintile | 611,736 |
| Highest Quintile | 1,246,615 |
| Top 5 Percent | 1,400,302 |
Key findings:
- Income disparities: The mean income of the lowest quintile (20% of households with the lowest income) is 53,642, while the mean income for the highest quintile (20% of households with the highest income) is 1,246,615. This indicates that the top earners earn 23 times compared to the lowest earners.
- Top 5%: The mean household income for the wealthiest population (top 5%) is 1,400,302, which is 112.33% higher compared to the highest quintile, and 2610.46% higher compared to the lowest quintile.
Furthermore, as per the Census Bureau, the Gini coefficient for Portola Valley is 0.5024. Gini coefficient is a numeric measure ranging from 0 to 1, where lower numbers indicate greater income equality (with 0 representing complete equality, where all households earn the same income) and higher values signify greater income inequality (with 1 being complete inequality where one household receives all income).
Sources: U.S. Census Bureau, American Community Survey (ACS)
With a Gini coefficient of 0.5024, it is evident that income distribution in Portola Valley, CA exihibits characterstics of moderate inequality .
This level of Gini coefficient suggests noticeable variations in income distribution across households, with certain segments of the population holding a larger share of income compared to others in Portola Valley.
It also implies that efforts may be needed to enhance economic fairness and reduce the gap between income groups in Portola Valley