Throughout this series we have examined several examples of how regions respond to rapid population growth. California showed the dangers of housing scarcity and regulatory complexity. Austin illustrated how expanding housing supply can moderate price pressure even during economic expansion. Northern Virginia and Florida demonstrated how corridor planning, infrastructure financing, and concurrency systems can help align development with public capacity.

Yet there is another example that may be even more relevant to the Upstate of South Carolina: Gwinnett County, Georgia .

Located northeast of Atlanta along the Interstate 85 corridor, Gwinnett experienced one of the most dramatic suburban growth transformations in the modern American South. Within a single generation it changed from a largely rural county into one of the most populous counties in Georgia and a major economic center within the Atlanta metropolitan region.

Gwinnett’s story is not simply a tale of rapid expansion. It is also a case study in how communities respond to the pressures created by growth. The county faced many of the same challenges now appearing in parts of the Upstate: traffic congestion, suburban sprawl, infrastructure strain, and the need to adapt planning systems as population increased.

Because Gwinnett’s experience unfolded over several decades, it provides a valuable regional example of how growth patterns evolve—and how planning strategies must evolve with them.

From Rural County to Metropolitan Suburb

For most of its early history, Gwinnett County was primarily rural. Farms, small towns, and scattered communities defined the landscape. That began to change after the construction of Interstate 85 , which connected the county directly to Atlanta.

The interstate highway made commuting between Gwinnett and Atlanta far easier. As the Atlanta economy expanded during the late twentieth century, housing demand spread outward into surrounding counties where land was still available.

Gwinnett quickly became one of the most attractive locations for suburban development. Developers built large residential subdivisions, shopping centers, and business parks. Families moved into the county seeking affordable housing and access to employment opportunities in Atlanta.

The population growth that followed was extraordinary.

In 1970 Gwinnett had fewer than 75,000 residents. By 1990 the population had surpassed 350,000. By 2010 the county had grown to more than 800,000 residents, making it one of the fastest-growing counties in the United States during that period.

This expansion fundamentally transformed the county’s character. What had once been farmland and small towns became a dense suburban landscape connected to one of the nation’s largest metropolitan areas.

The Early Growth Pattern: Suburban Expansion

Like many rapidly growing counties during the late twentieth century, Gwinnett’s early development followed the classic suburban pattern.

Large subdivisions spread across previously rural land. Retail development appeared along major roads in the form of shopping centers and strip commercial corridors. Office parks and industrial facilities followed transportation routes that connected the county to Atlanta.

This pattern provided housing quickly and supported economic growth, but it also produced challenges.

Road networks designed for rural traffic suddenly carried thousands of commuters. Infrastructure investments struggled to keep pace with development. Residents increasingly faced longer travel times as congestion appeared on major corridors.

Schools, public safety facilities, parks, and utilities had to expand rapidly to support the growing population.

These pressures forced local leaders to reconsider how development should be organized.

The Infrastructure Challenge

Rapid population growth places significant demands on public infrastructure. Roads must be widened or extended. Water and sewer systems require expansion. New schools and fire stations must be built to serve expanding neighborhoods.

Gwinnett County responded with substantial investments in infrastructure, particularly in transportation.

Major arterial roads were widened to accommodate increasing traffic volumes. Interchanges along Interstate 85 were expanded to support commuter flows and freight transportation. The county invested heavily in water and sewer systems to ensure that new subdivisions and commercial projects could be served reliably.

At the same time, Gwinnett introduced impact fees to help finance infrastructure improvements associated with new development. These fees required developers to contribute to the cost of roads, parks, libraries, and public safety facilities needed to serve growing communities.

Impact fees did not eliminate infrastructure challenges, but they provided a funding mechanism that connected growth with public investment.

The Shift Toward Planning and Coordination

As Gwinnett matured, county leaders recognized that growth could not continue indefinitely without a more coordinated planning framework.

Comprehensive planning became an increasingly important tool. The county developed long-term land-use plans identifying areas appropriate for residential growth, commercial development, and employment centers.

Rather than allowing development to spread evenly across the landscape, planners began encouraging more organized growth patterns .

These efforts included improvements to zoning regulations, stronger development review processes, and expanded capital improvement planning for infrastructure investments.

The goal was not to stop growth but to guide it in ways that reduced infrastructure strain and improved community design.

Activity Centers and Corridor Development

One of the most important planning concepts Gwinnett adopted was the idea of activity centers .

Instead of relying entirely on scattered suburban development, the county identified key intersections and commercial districts where higher-density mixed-use development could occur. These activity centers often included housing, retail, offices, and civic spaces within relatively compact areas.

Examples include the Gwinnett Place area near Duluth , which evolved from a regional shopping mall into a broader redevelopment district with mixed-use potential.

Activity centers allow infrastructure investments to serve larger numbers of people within defined areas rather than extending services across the entire county.

In addition to activity centers, Gwinnett began focusing on major transportation corridors as organizing elements for growth. Development along Interstate 85 and other major routes became more structured, with employment centers, residential communities, and commercial areas linked by transportation infrastructure.

This approach helped create a more coherent development pattern as the county transitioned from rural expansion to mature suburban growth.

Redevelopment and the Suburban Lifecycle

Another challenge that emerged as Gwinnett matured was the aging of earlier suburban development.

Retail centers built during the 1980s and 1990s eventually required reinvestment. Some commercial areas experienced declining activity as shopping patterns changed and newer developments appeared elsewhere.

Recognizing this cycle, Gwinnett began exploring strategies for redevelopment and revitalization .

Older commercial districts were targeted for reinvestment through zoning adjustments, infrastructure improvements, and public-private partnerships. Redevelopment efforts aimed to introduce mixed-use development, housing, and public spaces into areas that had previously been dominated by single-purpose retail centers.

This shift reflects a common pattern in suburban regions: as communities mature, redevelopment becomes as important as new development.

What Gwinnett Did Well

Gwinnett’s growth experience produced several positive outcomes.

First, the county allowed substantial housing supply expansion during its growth years. Large numbers of homes were built, helping accommodate population growth and maintain relatively accessible housing opportunities compared with many coastal metropolitan areas.

Second, Gwinnett attracted major employers and developed a diversified economy. Corporate offices, logistics facilities, and advanced manufacturing operations created jobs that supported the region’s prosperity.

Third, the county invested heavily in public infrastructure. Roads, utilities, schools, and parks expanded dramatically as the population increased.

Finally, Gwinnett demonstrated an ability to adapt planning strategies over time . As growth patterns evolved, the county adjusted its planning framework to incorporate activity centers, redevelopment strategies, and corridor planning.

Challenges That Took Decades to Address

Despite these successes, Gwinnett’s experience also revealed several long-term challenges.

Traffic congestion became a persistent issue as suburban development increased commuting demand. Retrofitting transportation infrastructure after development occurred proved expensive and time-consuming.

Low-density development patterns created infrastructure costs that were higher than they might have been with more concentrated growth.

Public services such as schools required continual expansion to keep pace with population growth.

These challenges illustrate an important lesson: it is far easier to guide growth patterns early than to retrofit infrastructure later.

A Comparison With Spartanburg County

Gwinnett’s experience becomes even more interesting when compared with conditions in Spartanburg County.

Gwinnett County today has a land area of about 431 square miles and a population of roughly one million residents .

Spartanburg County, by contrast, has a land area of approximately 807 square miles —nearly twice the size of Gwinnett—but a population of about 370,000 residents .

This comparison highlights an important reality. Spartanburg County still has substantial room for growth compared with Gwinnett’s current population density.

The Upstate therefore has an opportunity that Gwinnett did not fully possess during its early growth years: the chance to learn from the experiences of nearby regions before infrastructure pressures reach the same intensity .

By planning thoughtfully today, Spartanburg can guide development patterns that support both economic growth and community livability.

Lessons for the Upstate

Gwinnett County’s history offers several lessons for the Upstate.

Growth is easier to guide early than to correct later. Once development patterns are established, retrofitting infrastructure becomes costly and complex.

Housing supply should remain strong. Regions that continue building homes are less likely to experience the extreme affordability crises seen in some other metropolitan areas.

Corridor planning and activity centers can help organize development efficiently. Concentrating growth where infrastructure can support it reduces long-term costs.

Infrastructure investment must anticipate growth rather than react to it.

Finally, long-time landowners should have opportunities to benefit from development without overwhelming public infrastructure systems.

Looking Ahead

Gwinnett County’s transformation demonstrates both the opportunities and the challenges that accompany rapid growth in the American South.

The Upstate of South Carolina is now entering a similar phase of expansion as population growth, economic investment, and regional connectivity accelerate along the Interstate 85 corridor.

Understanding how Gwinnett evolved helps illuminate the choices now facing communities in the Upstate.

The final article in this series will bring together the lessons from Greenville, California, Austin, Northern Virginia, Florida, and Gwinnett to outline a forward-looking vision for Spartanburg County and the Upstate region —a vision in which growth strengthens communities, supports families, and makes the region one of the most desirable places in America to live, work, build a business, and raise a family.