10,000 Cities—and Counting

A novel approach to quantifying the world's urban population provides insight into a changing world.

2 minute read

February 28, 2021, 11:00 AM PST

By James Brasuell @CasualBrasuell


China

Shenzen, China is the leading example of a new era in urbanization. | Cardaf / Shutterstock

The European Commission and the Organization for Economic Cooperation and Development (OECD) recently presented "groundbreaking new mapping research" at World Urban Forum 10, concluding that there are around 10,000 cities in the world.

Gregory Scruggs shares insight into the unprecedented effort to document and define the contemporary city in an article for Next City. Nailing down a definition of cities is surprisingly challenging. Nuances can neglect huge swaths of the built environment or in wildly different population estimates.

No two countries define cities the same way, notes Scruggs: "In Denmark, 200 people living near each other constitutes a city. In Japan, the threshold is 50,000," for example.

The new mapping project overcomes some of those challenges by adding a third definition besides urban and rural: the town. According to Scruggs's explanation of the new definition, "over a quarter of the planet lives in towns — like those Danish hamlets of 200-odd souls — a category that the world has largely ignored in its preference for an urban-rural binary, the idea that someone either lives in a city or in the countryside."

A few findings from the study stand out: half of the world's 10,000 cities didn't exist 40 years ago, for example, and 20 percent of the world's cities are shrinking. "[Shrinking is] getting more common in countries where the population has started to stagnate or decline," according to a quote from OECD’s head of urban statistics, Rudiger Ahrend, included in the article.

Friday, February 12, 2021 in Next City

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

July 2, 2025 - Diana Ionescu

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

White and purple sign for Slow Street in San Francisco, California with people crossing crosswalk.

San Francisco Suspends Traffic Calming Amidst Record Deaths

Citing “a challenging fiscal landscape,” the city will cease the program on the heels of 42 traffic deaths, including 24 pedestrians.

July 1, 2025 - KQED

Blue and silver Amtrak train at small station.

Amtrak Rolls Out New Orleans to Alabama “Mardi Gras” Train

The new service will operate morning and evening departures between Mobile and New Orleans.

July 3 - New Orleans City Business

Large spinning swing ride at Chicago's Navy Pier.

The Subversive Car-Free Guide to Trump's Great American Road Trip

Car-free ways to access Chicagoland’s best tourist attractions.

July 3 - Streetsblog Chicago

Aerial view of downtown San Antonio, Texas at night with rotating Tower of the Americas in foreground.

San Antonio and Austin are Fusing Into one Massive Megaregion

The region spanning the two central Texas cities is growing fast, posing challenges for local infrastructure and water supplies.

July 3 - Governing