Concentric Zone Model: Burgess’s Five Rings Explained

The concentric zone model is a theory of urban structure that describes a city as a set of rings spreading out from a single central business district, with each ring holding a different land use and social group. Ernest W. Burgess published it in 1925 after studying Chicago, and it became the first systematic diagram of how a city sorts itself.

It is also called the Burgess model, the Burgess concentric zone model, or simply the concentric model. All four names refer to the same five-ring diagram. This guide covers where it came from, what each ring actually contained, where it still reads a city correctly in 2026, and the three specific situations where it fails badly enough that using it will mislead your analysis.

Who Made the Concentric Zone Model, and Why

Ernest Watson Burgess was a sociologist at the University of Chicago. His chapter “The Growth of the City: An Introduction to a Research Project” appeared in Park, Burgess and McKenzie, The City (1925), the book he wrote with Robert Park and Roderick McKenzie that founded what is now called the Chicago School of urban sociology. The chapter is short, roughly fifteen pages, and the famous diagram sits on a single chart inside it.

The context matters. Chicago’s population went from about 500,000 in 1880 to well over three million by 1930. Burgess was not theorising in the abstract; he was trying to explain a city that had tripled in a working lifetime, absorbing waves of European immigrants and, after 1916, the Great Migration from the American South. His question was not “what should a city look like” but “what pattern does explosive growth leave behind?”

His answer borrowed from plant ecology. Burgess described growth as invasion, succession and dominance: each inner ring expands outward, pushes into the ring beyond it, and the displaced population moves further out in turn. The rings are not fixed boundaries. They are a snapshot of a process that never stops. This is the part most summaries drop, and dropping it turns a theory of movement into a static picture of where poor people live.

📌 Did You Know?

Burgess did not invent concentric reasoning. Johann Heinrich von Thünen had modelled agricultural land use as rings around a market town almost a century earlier in Der isolierte Staat (1826, expanded 1850). Von Thünen’s driver was transport cost for perishable goods; Burgess swapped in social competition for land. If you have ever seen the two diagrams side by side and thought they looked related, they are.

The Five Zones, and What Each One Actually Contained

Most reproductions of the diagram label the rings with generic terms. Burgess’s own chart was specific to Chicago and carried real neighbourhood names. The table below gives both, plus the closest 2026 equivalent, because the labels have aged very differently.

Two details in that table do the real explanatory work. First, Zone II is the only ring defined by what is happening to it rather than by who lives there. Burgess called it a zone of transition because it was being eaten from the inside by the expanding Loop. Second, Zone V is measured in travel time, not distance. Burgess gave it as a thirty to sixty minute rail commute. That single choice is why the model still transfers: swap rail for motorway and the ring moves outward without the logic changing.

Where the Model Breaks, and Why That Matters

Half of Burgess’s own rings were in a lake

Chicago sits on Lake Michigan. Drawing complete circles around the Loop puts roughly half of each ring in open water. Burgess knew this and drew the chart anyway, as an idealisation. The problem is that every coastal, riverside or mountain-bounded city inherits the same distortion, and most cities are bounded by something. Treat the rings as a gradient, not a geometry.

Homer Hoyt showed the growth runs in wedges

In The Structure and Growth of Residential Neighborhoods in American Cities (1939), Homer Hoyt analysed residential rent data across 142 American cities for the Federal Housing Administration and found that high-rent areas did not form a ring. They formed a sector: a wedge running from the centre out to the edge, usually following a fast transport line, high ground or a waterfront, and usually staying put for decades. This is the single most useful correction to Burgess, because it explains why one side of a city stays expensive across generations while the opposite side at the same radius does not.

Harris and Ullman showed there is rarely one centre

Chauncy Harris and Edward Ullman published “The Nature of Cities” (1945) in the Annals of the American Academy of Political and Social Science, arguing that cities grow around multiple nuclei: a port, a university, an industrial park, an airport, each generating its own land-use gradient. Some uses attract each other, some repel. Their model has no single centre, so it handles polycentric metropolitan regions in a way Burgess cannot.

The rings were not natural, they were drawn by policy

This is the criticism that has aged into the most important one. Burgess’s ecological language, invasion and succession, presents residential sorting as a natural process. It was not. Racially restrictive covenants were in wide use in Chicago by the 1920s, and from 1935 the Home Owners’ Loan Corporation graded neighbourhoods for mortgage risk on colour-coded maps. You can read Mapping Inequality’s scans of the 1940 HOLC map of Chicago and see the grades laid directly over Burgess’s zones. Zone III and the inner edge of Zone IV are where the yellow and red grades cluster. The pattern Burgess described as ecology was in large part underwriting policy.

Burgess, Hoyt and Harris-Ullman Compared

These three models are usually taught together and are routinely confused with each other. They are not competing answers to the same question; each one privileges a different driver.

In practice a large city usually shows all three at once. A concentric gradient of building age, a Hoyt wedge of high rent along one corridor, and two or three Harris-Ullman nuclei around an airport or a university. Reading a city well means noticing which one dominates where, not picking a winner. The distribution of tall building clusters in a metropolitan region is a good place to see the difference, since skyline mass tends to follow nuclei rather than rings.

What the Model Still Gets Right

Three things have held up for a century.

• Land value peaks at the centre and decays outward. The specific gradient varies enormously, but the shape is robust. It is why average apartment sizes tend to shrink as you approach a core, independent of country or building culture.
• Building age correlates with distance from the centre. This is often more reliable than the social pattern Burgess described, because it is a consequence of when construction reached that radius. It is a useful first read on likely building obsolescence patterns across a city.
• The zone in transition is real and still moving. Burgess’s Zone II is the concept that survived best. Rename it the gentrification frontier and the mechanism, an inner ring being invaded and its population displaced outward, is the same one urban researchers describe today.

Terms the Concentric Zone Model Is Confused With

The distinction between a model and a mechanism is worth holding onto. Bid-rent theory explains why land near a centre commands more; the concentric zone model is one possible outcome of that pressure. Hoyt’s sectors and Harris and Ullman’s nuclei are two other outcomes of the same underlying pressure under different transport and terrain conditions.

How Architects Actually Use It

The model earns its place in an architectural workflow in three narrow, concrete ways.

As a first hypothesis in site analysis. Before you have local data, the concentric assumption gives you a testable starting guess about building age, plot size, tenure mix and likely development pressure at your radius. You then look for the Hoyt wedge and the secondary nuclei that break it. A hypothesis you disprove in an afternoon is more useful than no hypothesis at all.

As a way to explain context to a client or a planning committee. The rings are legible to non-specialists in a way that a land-use map is not. This is the same reason the diagram survives in teaching: it compresses a very large amount of urban structure into a shape anyone can read. Writing that reading up clearly is a large part of how architects work at the scale of a city.

As a check on zoning arguments. If you are arguing for a rezoning, the model tells you which ring your proposal is asking to move outward and who is standing in the way of that movement. The mixed-use versus single-use zoning debate is, in Burgess’s terms, an argument about whether Zone I uses should be allowed to appear inside Zone III and IV.

The Short Version

The concentric zone model is a hundred-year-old snapshot of one American city that turned out to describe a real and repeating gradient: land value and building age fall as you move outward from a centre, and the inner rings expand into the outer ones over time. It gets the mechanism partly wrong, because it presents as ecology a sorting that was substantially produced by covenants and lending policy, and it gets the geometry wrong for any city with a coast, a mountain or more than one centre. Read it alongside Hoyt and Harris-Ullman, treat it as a hypothesis rather than a description, and it remains one of the fastest ways to start reading an unfamiliar city. Concepts like this one sit inside a longer argument about what architecture is and what it is responsible for.