The Most Extreme Census Tracts in America

The Census Bureau divides the country into more than 84,000 census tracts, each one designed to capture a neighborhood-sized slice of American life with somewhere between 1,200 and 8,000 residents. Most tracts are unremarkable in the statistical sense - middle of the distribution on income, density, poverty, home values. But the ones at the extremes tell stories that city-level or county-level data can never surface. A tract with 44,000 residents. A neighborhood where the median home value exceeds $2 million. A block where 0% of residents live in poverty. These places exist, and the CensusEasy tract rankings put all of them in one place.

Here is what the extremes actually look like.

The most populous tracts: suburban Texas dominates

The single most populous census tract in the United States is Tract 6732-02 in Fort Bend County, Texas, with 44,364 residents packed into a single tract boundary. That is more people than live in cities like Flagstaff, Arizona or Burlington, Vermont, contained in a geographic unit designed to cover a neighborhood. The number two slot belongs to Tract 5429-02 in Harris County, Texas with 42,523 residents. Texas has four of the top ten most populous tracts in the country.

What these tracts have in common is master-planned suburban development at scale. Fort Bend and Harris Counties sit in the Houston metro, where large parcels of flat, developable land and permissive zoning have enabled the construction of massive apartment complexes and townhome communities that pack tens of thousands of people into relatively small footprints. The tenth most populous tract, Tract 303-07 in Collin County, has 23,389 residents and sits in the Frisco-area suburbs north of Dallas, reflecting the same pattern of dense suburban multifamily development in the fastest-growing part of the DFW metro.

Outside Texas, Tract 187 in San Diego County comes in third nationally at 40,415 residents, and Florida has three entries in the top ten: Broward County's Tract 105-03 at 25,856, Orange County's Tract 171-11 at 25,639, and Duval County's Tract 144-23 at 23,561.

The densest tracts: New York City by a wide margin

Density is where New York asserts itself so completely that the rest of the country barely registers. The densest tract in America is Tract 455 in Queens County at 223,632 residents per square mile. The national average population density is around 94 people per square mile. Tract 455 is roughly 2,380 times denser than that average. The second densest is Tract 261 in Manhattan at 200,683 per square mile, followed by Tract 245, also in Manhattan, at 177,768. Tracts four through ten on the density list are all in Manhattan, ranging from 165,814 down to 149,701 residents per square mile.

To put these numbers in physical terms: at 223,632 residents per square mile, Tract 455 in Queens has roughly 348 people per acre. A standard American football field is about 1.3 acres. That tract has the population equivalent of more than 250 people for every football field of land. The built environment that produces this density is overwhelmingly pre-war tenement and apartment construction, six-to-eight-story walk-ups on tight lots with minimal setbacks, a building pattern that essentially no American city has replicated at scale since World War II.

The highest-income tracts: suburban Philadelphia surprises everyone

The wealthiest census tracts in America are not in Manhattan, Beverly Hills, or the Hamptons. They are in the suburbs of Philadelphia. The top of the income ranking is dominated by Pennsylvania counties that most people outside the region have never thought much about. Tract 2046 in Montgomery County leads the list at the ACS ceiling of $250,001 in median household income, joined by Tract 1055-08 in Bucks County, Tract 4097-01 in Delaware County, Tract 9816-06 in Cumberland County, and Tract 3003-02 in Chester County. Five of the top ten wealthiest tracts in the United States are in the Philadelphia suburban ring.

The $250,001 figure is the ACS survey ceiling, meaning the actual median in these tracts is somewhere above that number and the instrument simply cannot capture how wealthy they are. These are communities of executives, lawyers, physicians, and finance professionals who have lived in the same zip codes for decades, accumulated home equity in one of the country's most stable housing markets, and built household incomes that sit at the very top of the national distribution.

The non-Pennsylvania entries in the top ten are equally interesting. Tract 1064-01 in Oklahoma County at $250,001 represents the oil-and-gas wealth concentrated in parts of Oklahoma City's most affluent neighborhoods. Tract 1791-02 in Cuyahoga County, Ohio, at the same ceiling, reflects the old-money wealth that has persisted in Cleveland's most prosperous suburbs despite the city's broader economic struggles. Tract 538-03 in Wake County and Tract 27-01 in Mecklenburg County round out the top ten, both North Carolina entries reflecting the high-income professional communities that have grown up around Raleigh's Research Triangle and Charlotte's financial sector.

The highest home value tracts: Los Angeles has no competition

If income is Philadelphia's category, home values belong to Los Angeles without argument. The top ten highest home value tracts in the country are all in Los Angeles County, and all of them have hit the ACS ceiling of $2,000,001, meaning the actual median is above two million dollars and the survey cannot measure it. Tract 2624 leads the list, followed by Tract 2168 and eight others in the same range, all of them concentrated in the hillside communities of the Santa Monica Mountains corridor - Bel Air, Brentwood, Pacific Palisades, and adjacent neighborhoods where the combination of ocean views, land scarcity, and decades of demand from entertainment and tech industry wealth has produced home prices that function as their own category.

The $2,000,001 ceiling is itself a statement about how the ACS was designed. The survey was built to capture the full range of American housing costs, and the architects of the instrument presumably thought a $2 million ceiling would be more than adequate. In these tracts it is not.

The most educated tracts: universities top the list

The tract with the highest share of adults holding a bachelor's degree or higher is Tract 9818 in Suffolk County, Massachusetts, at 100%. It is joined at the top by Tract 44-94 in Ingham County, Michigan, Tract 38-01 in the District of Columbia, and Tract 122 in Centre County, Pennsylvania - home to Penn State University.

The 100% figure warrants some explanation. These are not residential neighborhoods where every single adult independently chose to pursue a degree. They are tracts whose boundaries coincide so closely with a university campus or graduate student housing complex that the resident population is overwhelmingly composed of enrolled students and academic staff. Ingham County is home to Michigan State University. The DC tract likely encompasses a federal research or academic campus. The Suffolk County tract sits within Boston's dense concentration of universities. These entries reflect geography more than general education levels, but they are real data points: the Census counted every person in those tracts and found that 100% of adults 25 and older had at least a bachelor's degree.

The lowest poverty tracts: retirement communities and gated suburbs

The tracts with zero percent poverty are a mixed group. Tract 217-20 in Denton County, Texas leads the list, followed by Tract 9706-02 in Carteret County, North Carolina. The 0.0% figure means that in the ACS survey window, not a single resident of those tracts reported income below the federal poverty line.

These tracts tend to fall into a few categories: affluent planned retirement communities where residents are drawing from accumulated assets rather than wages, gated suburban subdivisions with strict homeowner qualification requirements, and small tracts with limited populations where statistical variance makes a 0% reading more plausible than it would be in a larger tract. A retirement community in coastal North Carolina or suburban Texas where every household is living on a pension, Social Security, and investment income above the poverty threshold is a real phenomenon, and the Census captures it accurately.

What the extremes reveal about the country

Read across all six categories and a few patterns emerge. Extreme density is a New York phenomenon with essentially no competition from any other American city. Extreme wealth by income measure is concentrated in old-money suburban rings around older northeastern cities, not in the glamorous coastal enclaves that dominate popular coverage of American inequality. Extreme home values are a California story, specifically a Los Angeles story, and the gap between those tracts and everywhere else in the country is enormous. Extreme population concentration is a Sun Belt phenomenon driven by suburban development patterns that have no equivalent in the Northeast or Midwest.

The extremes also reveal how much the median obscures. A city's median income or poverty rate tells you the midpoint of a wide distribution. The tract-level data shows you the actual shape of that distribution, which is almost always more unequal, more varied, and more interesting than any single number can convey. You can explore all 18 ranking categories, filtered by state or nationally, on the tract rankings page, and look up any specific tract on the interactive map.