Green Knoll, New Jersey Demographics & Population 2026
During the 2020–2024 ACS period, Green Knoll, New Jersey had a total population of 6,789, the 236th largest community in New Jersey, with a median household income of $165,227, which is 60% higher than the state average. The poverty rate is 3.3%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 60% above the state average — one of the wealthiest communities in New Jersey.
- An exceptionally low poverty rate of 3.3% — among the lowest in New Jersey.
Green Knoll Quick Facts
How Green Knoll Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 6,664 | 6,789 | +1.9% |
| Median household income | $156,630 | $165,227 | +5.5% |
| Median home value | $581,600 | $597,100 | +2.7% |
How Green Knoll Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 66 | National average: 61
Education
Educational Attainment (Adults 25+)
Green Knoll Rankings in New Jersey
Explore New Jersey Rankings
Other Cities in Somerset County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| North Plainfield | 22,809 | $87,349 | 13.2% | $374,700 |
| Somerset | 22,720 | $121,028 | 4.5% | $438,800 |
| Hillsborough | 22,585 | $144,112 | 2.7% | $435,700 |
| Bradley Gardens | 14,165 | $177,849 | 4.2% | $546,300 |
| Somerville | 13,410 | $103,760 | 5.9% | $435,700 |
| Franklin Park | 13,211 | $114,946 | 11.0% | $336,600 |
| Bound Brook | 12,219 | $90,571 | 11.1% | $397,100 |
| Martinsville | 11,559 | $205,000 | 1.4% | $720,400 |
| East Franklin | 11,070 | $115,458 | 5.9% | $385,900 |
| Manville | 10,921 | $93,333 | 11.7% | $354,300 |
Cities Similar to Green Knoll
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Allendale | 6,865 | $160,162 | $782,700 | 72.5% | 3.7% |
| Franklin Center | 6,646 | $157,212 | $612,000 | 63.5% | 7.3% |
| Strathmore | 6,708 | $151,855 | $539,500 | 64.8% | 1.9% |
| Linwood | 6,992 | $156,354 | $394,700 | 62.2% | 2.0% |
| Watchung | 6,485 | $173,672 | $882,500 | 64.0% | 1.2% |
Population Overview
Green Knoll is a small city located in New Jersey, within Somerset County. The total population is 6,789. It ranks as the 236th most populous out of 700 Census-designated places in New Jersey.
Age Demographics
The median age in Green Knoll is 44.5 years. This is 11% higher than the state median of 40.1 years. 11.7% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.
Economy, Income & Housing
The median household income in Green Knoll is $165,227. This is 60% higher than the state median of $103,556. It is also 105% higher than the national median of $80,734. The poverty rate stands at 3.3%. This is 66% lower than the state poverty rate of 9.7%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 4.2%. This is 33% lower than the state rate of 6.3%. The median home value is $597,100. Housing costs are 31% higher than the state median of $454,400. The home-value-to-income ratio is 3.6x. 78.8% of occupied housing units are owner-occupied. This homeownership rate is 24% higher than the state average of 63.8%.
Race & Ethnicity
The largest racial or ethnic group in Green Knoll is White (non-Hispanic), making up 63.6% of the population. Asian residents account for 21.7%. The Black or African American population (4.9%) is well below the state average of 12.2%. The Hispanic or Latino population (6.2%) is well below the state average of 22.5%. The Asian population is significantly higher than the state average (21.7% vs 10.1%).
Education
58.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 33% higher than the state rate of 43.6%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 96.8%. Notably, 21.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Green Knoll, New Jersey is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against New Jersey state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 700 Census-designated places in New Jersey. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Green Knoll, New Jersey?
Green Knoll, New Jersey has a population of 6,789 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Green Knoll, NJ?
The median household income in Green Knoll is $165,227, which is 105% higher than the national median of $80,734.
What is the poverty rate in Green Knoll, NJ?
The poverty rate in Green Knoll is 3.3%. This means approximately 217 residents live below the federal poverty line.
What is the racial makeup of Green Knoll, New Jersey?
Green Knoll's population is 63.6% White, 4.9% Black, 6.2% Hispanic/Latino, and 21.7% Asian.
What is the median home value in Green Knoll, NJ?
The median home value in Green Knoll is $597,100. The home-value-to-income ratio is 3.6x.
How educated is Green Knoll, New Jersey?
58.0% of adults (25+) in Green Knoll hold a bachelor's degree or higher, and 21.7% hold a graduate or professional degree.