Suburbanization

Suburbanization is the process of population and economic activity moving from central cities to surrounding suburbs, producing new land-use forms like edge cities, exurbs, and boomburbs (EK PSO-6.A.4) and creating sustainability challenges such as sprawl and farmland loss.

Verified for the 2027 AP Human Geography examLast updated June 2026

What is Suburbanization?

Suburbanization is the outward movement of people, housing, jobs, and services from a central city into the surrounding suburbs. In the U.S., it took off after World War II thanks to cars, highways, cheap land, and government-backed home loans. Improved transportation is the big enabler. When commuting gets faster and cheaper, people can live farther from where they work, and the city spreads outward.

The CED frames suburbanization as one of the core processes that reshape cities (Topic 6.2). Together with sprawl and decentralization, it created new land-use forms you need to know by name, including edge cities (job centers on the urban fringe), exurbs (semi-rural communities beyond the suburbs), and boomburbs (rapidly growing suburban cities). But suburbanization is a two-sided story. The suburbs gain population and tax revenue while the central city can lose both, which is exactly the inner-city decline setup the College Board used on the 2017 FRQ.

Why Suburbanization matters in AP Human Geography

Suburbanization lives primarily in Unit 6 under LO 6.2.A, which asks you to explain the processes that initiate and drive urbanization and suburbanization. It also feeds directly into LO 6.11.A, because suburban sprawl is listed as a challenge to urban sustainability, and responses like urban growth boundaries and farmland protection policies exist specifically to contain it. But this term refuses to stay in one unit. It connects to migration patterns (Unit 2), the look of the cultural landscape (Unit 3, think cookie-cutter subdivisions and strip malls), and the loss of farmland on the urban fringe (Unit 5). That cross-unit reach is why suburbanization shows up so often in both MCQs and FRQs.

How Suburbanization connects across the course

Urban Sprawl (Unit 6)

Suburbanization is the process of people moving outward; sprawl is the low-density, car-dependent landscape that process leaves behind. The CED treats sprawl as a sustainability challenge (LO 6.11.A), so suburbanization is essentially the cause and sprawl is the consequence.

Exurbs and Boomburbs (Unit 6)

EK PSO-6.A.4 names edge cities, exurbs, and boomburbs as the new land-use forms suburbanization created. Think of them as suburbanization pushed to different distances and intensities, with exurbs sitting farthest out, past the traditional suburban ring.

Gentrification (Unit 6)

Gentrification is roughly suburbanization in reverse. Wealthier residents move back into the urban core and renovate it, which is one of the redevelopment responses cities used to counteract the population loss the 2017 FRQ describes.

Farmland Loss and Food Production (Unit 5)

Suburbs grow outward onto farmland at the urban edge. That is why farmland protection policies and urban growth boundaries appear in the CED as sustainability responses, linking your Unit 6 sprawl knowledge directly to Unit 5 debates about feeding a growing population.

Is Suburbanization on the AP Human Geography exam?

On multiple choice, expect cause-and-effect stems. Practice questions ask for a common cause of suburbanization in developed countries (rising incomes, car ownership, desire for space, government housing policy) and how improved transportation contributes to it (longer feasible commutes mean people can live farther from city-center jobs). On FRQs, suburbanization usually shows up as a setup for something else. The 2017 FRQ Q1 opened with cities declining because of deindustrialization and population loss to suburbanization, then asked about strategies to counteract inner-city decline. So you need to do two things with this term: explain what drives it, and trace its consequences, including sprawl, central-city tax base erosion, and the planning responses in LO 6.11.A like urban growth boundaries and brownfield redevelopment.

Suburbanization vs Urban Sprawl

Suburbanization is the movement of people and activity out of the central city. Urban sprawl is the resulting pattern of unplanned, low-density, car-dependent development spreading across the landscape. You can have suburbanization that is compact and planned; sprawl is what happens when it isn't. On the exam, use suburbanization when the question is about why people move, and sprawl when it is about the land-use consequences and sustainability problems.

Key things to remember about Suburbanization

  • Suburbanization is the movement of people, jobs, and services from central cities to surrounding suburbs, driven by cars, highways, cheaper land, and rising incomes.

  • EK PSO-6.A.4 says suburbanization, sprawl, and decentralization created new land-use forms you must know by name: edge cities, exurbs, and boomburbs.

  • Improved transportation is the key enabler, because faster commutes let people live farther from city-center jobs.

  • Suburbanization caused inner-city decline in many U.S. cities by pulling population and tax revenue out of the core, the exact scenario in the 2017 FRQ.

  • Suburban sprawl is a major urban sustainability challenge, and responses include urban growth boundaries, regional planning, brownfield redevelopment, and farmland protection policies (LO 6.11.A).

  • Suburbanization is mostly a developed-country story; rapid urbanization into megacities is the dominant pattern in the periphery and semiperiphery.

Frequently asked questions about Suburbanization

What is suburbanization in AP Human Geography?

Suburbanization is the process of people and economic activity moving from central cities to surrounding suburbs. The CED covers it in Topic 6.2 under LO 6.2.A and ties it to new land-use forms like edge cities, exurbs, and boomburbs.

Is suburbanization the same thing as urban sprawl?

No. Suburbanization is the movement of people outward from the city; sprawl is the low-density, unplanned development pattern that movement often produces. The CED lists sprawl, not suburbanization itself, as the urban sustainability challenge.

What causes suburbanization in developed countries?

Car ownership, highway construction, cheaper land on the urban fringe, rising incomes, and the desire for more space and lower-density living. Improved transportation matters most because it makes longer commutes practical.

Is suburbanization the opposite of gentrification?

Roughly, yes. Suburbanization moves wealthier residents out of the urban core, while gentrification moves wealthier residents back in and renovates declining neighborhoods. Cities hit by suburbanization-driven decline often used redevelopment to spark that return.

How does suburbanization hurt cities?

When residents and businesses leave, the central city loses population and tax revenue, which can trigger inner-city decline. The 2017 FRQ paired this with deindustrialization and asked how cities counteracted it through redevelopment strategies.