South San Francisco, CA median household income trends: 2010 to 2021
From 2010 to 2021, the median household income for South San Francisco increased by $21,886 (21.87%), 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 8 years and declined for 3 years.
The most significant year-by-year growth occured from 2018 to 2019, when the median household income increased by 7,773 (from $113,317 to $121,090). Similarly the most substantial year-by-year decline occured from 2011 to 2012, when the median household income decreased by 4,552 (from $98,778 to $94,226).
In California, among cities with populations exceeding 50,000 residents, South San Francisco ranks 33rd out of 176 for median household income. This rank highlight its position as one of the top-earning large cities within the state of California.
Overall South San Francisco is ranked 82nd amongst all large cities in the US. In the category of large cities in the United States, those with populations exceeding 50,000 residents, South San Francisco ranks 82nd for its median household income, underscoring its position as one of the top-earning large cities in the country.
Median household income in South San Francisco, CA by household size
To gain deeper insights into the median household income for South San Francisco, 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, all of the household sizes were found in South San Francisco. Across the different household sizes in South San Francisco the mean income is $147,150, and the standard deviation is $52,811. The coefficient of variation (CV) is 35.89%. This high CV indicates high relative variability, suggesting that the incomes vary significantly across different sizes of households.
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 $62,980. It then further increased to $231,959 for 7-person households, the largest household size for which the bureau reported a median household income.
South San Francisco 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 | 62,980 |
| 2-person households | 109,362 |
| 3-person households | 146,486 |
| 4-person households | 178,930 |
| 5-person households | 150,356 |
| 6-person households | 149,977 |
| 7-or-more-person households | 231,959 |
According to the Census Bureau data, the median household income reaches its peak among 7-or-more-person households, reaching $231,959 .
South San Francisco, CA income distribution and inequality
To gain a comprehensive understanding of income distribution in South San Francisco, 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 South San Francisco
The table below presents the mean household income for each of the five quintiles in South San Francisco, offering valuable insights into income distribution and inequality.
| Income Level | Mean Household Income |
|---|---|
| Lowest Quintile | 28,509 |
| Second Quintile | 76,057 |
| Third Quintile | 124,520 |
| Fourth Quintile | 195,661 |
| Highest Quintile | 380,034 |
| Top 5 Percent | 635,669 |
Key findings:
- Income disparities: The mean income of the lowest quintile (20% of households with the lowest income) is 28,509, while the mean income for the highest quintile (20% of households with the highest income) is 380,034. This indicates that the top earners earn 13 times compared to the lowest earners.
- Top 5%: The mean household income for the wealthiest population (top 5%) is 635,669, which is 167.27% higher compared to the highest quintile, and 2229.71% higher compared to the lowest quintile.
Furthermore, as per the Census Bureau, the Gini coefficient for South San Francisco is 0.4401. 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 0.4401, it is evident that income distribution in South San Francisco, 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 South San Francisco.
It also implies that efforts may be needed to enhance economic fairness and reduce the gap between income groups in South San Francisco