City Population: Why One Number Doesn't Tell the Whole Story
August 29, 2026
When people search for the population of a city, they generally expect to see one simple number. But what exactly does that number represent?
In many cases, the population displayed by statistics websites represents only the people living within the official municipal boundaries of an incorporated city or town.
While that figure is important - and is the way the Census Bureau reports an official municipal population - it may not accurately represent the size of the broader community that people commonly associate with that city.
This distinction can make a surprisingly large difference.
The Problem With Using City Limits as the Entire Community
Most population websites rely heavily on Census data and other estimates tied to official geographic boundaries. This is useful for determining how many people live within a city or town's incorporated limits.
The problem is that communities don't always stop at those boundaries.
People live in surrounding unincorporated areas, shop at the same stores, attend the same schools, work in the same business districts, use the same services, and identify themselves with the same community - even when their homes are technically outside the municipal limits but have the same city as their address.
Mailing addresses can make the situation even more confusing.
Consider Mooresville, North Carolina (Just one example of many)
A real-world example of why municipal population and community population can tell two very different stories.
If you search for Mooresville, North Carolina by city, the estimated 2026 population is approximately:
That number represents the population within the official municipal boundaries of the Town of Mooresville.
However, the broader Mooresville community extends beyond those boundaries. A significant number of people living in the surrounding area have a Mooresville, NC mailing address even though they do not live inside the incorporated town limits.
For example, Mooresville's two primary ZIP codes contain approximately:
Approximately the number of people associated with a Mooresville, NC mailing address.
That's a substantial difference from the approximately 57,078 people living within the official town boundaries.
57,078 and 92,370 are not necessarily competing answers. They are measurements of different geographic areas.
Official Population vs. Community Population
The Census population is measuring something very specific: the population within a defined geographic boundary.
ZIP-code population data is measuring something different. It can provide an indication of the size of the broader geographic area associated with a particular mailing address.
Neither number is inherently "wrong."
The problem occurs when one number is presented as though it represents the entire community.
Population Websites Should Provide More Than One Definition
I believe there is an opportunity for population-statistics websites to provide users with a much more complete picture.
Instead of displaying only one population number, a modern population website could clearly distinguish between several different measurements.
Official City Population
The number of people living within the incorporated city or town limits. This should continue to rely on authoritative Census data and official population estimates.
Greater Community Population
An estimate of the population living in the broader area commonly associated with that city or town.
Depending on the community, this could potentially incorporate ZIP codes, census-designated areas, surrounding unincorporated communities, and other relevant geographic data.
ZIP-Code Population
The population of the ZIP codes commonly associated with the city or community.
This can be particularly useful for understanding the size of the area's mailing and service region.
What This Could Look Like
Imagine searching for Mooresville, North Carolina and seeing a page that clearly explains the different geographic definitions:
Mooresville, North Carolina
The official population represents residents living within the incorporated Town of Mooresville limits. The ZIP-code population represents the broader area in which residents use a Mooresville, NC mailing address.
That presentation is much more informative than simply displaying:
"Mooresville Population: 57,078"
The first approach gives the user context. The second can unintentionally give the impression that 57,078 represents the entire community.
Why This Matters
The way we define a community matters because people don't experience their communities according to municipal boundaries alone.
A resident doesn't necessarily care whether the grocery store they visit is inside the town limits.
Businesses don't necessarily define their customer base by municipal boundaries.
Schools, shopping centers, restaurants, medical facilities, churches, parks, and employment centers often serve residents from a much larger geographic area.
This Isn't About Replacing Census Data
The goal should not be to replace official Census population figures.
Census data is incredibly valuable and should remain the authoritative source for official municipal populations.
Instead, population websites should provide additional context.
An Opportunity to Build a Better Population Website
This creates an interesting opportunity for population-statistics websites.
A website that can accurately distinguish between municipal population, community population, and ZIP-code population could provide information that users aren't getting from traditional population searches.
Rather than simply answering the question:
"How many people live in this city?"
a better website could answer:
"How large is this community, and how is its population distributed across different geographic definitions?"
Who Could Benefit?
This type of information could be especially useful for people researching:
- Real estate markets
- Business opportunities
- Retail locations
- Population growth
- Economic development
- Housing demand
- Local demographics
- Relocation
- Market size
- Community growth
Mooresville Is Just One Example
Mooresville demonstrates the issue particularly well, but it is far from unique.
Throughout North Carolina - and across the United States - there are communities where substantial residential development has occurred outside official municipal boundaries.
As cities grow, development often spreads into surrounding unincorporated areas. Those residents may share the same mailing address, shopping areas, schools, employment centers, and community identity as residents inside the city.
Yet when someone searches for the city's population, they may see only the population contained within the relatively small incorporated boundary.
That can make a growing community appear smaller than it actually is.
The Future of Population Statistics
There isn't necessarily one "correct" population number for every community.
There is a correct population number for a particular geographic definition.
The important thing is making that definition clear.
A modern population-statistics website should recognize that "city," "town," "ZIP code," "mailing area," and "community" are not always interchangeable geographic concepts.
Instead of forcing all of these concepts into one number, websites can give users the information needed to understand each one.
The key takeaway
The key is to stop treating "city population" and "community population" as if they are always the same thing.
A population website that clearly distinguishes between these geographic definitions could provide a more complete, transparent, and useful picture of how large America's communities really are.
A Challenge to Population Statistics Websites
There are many websites that report population statistics for cities and towns across the United States. Most rely on official municipal boundaries when reporting those numbers.
Here's my challenge:
Just one of you report the population of an entire city area, not just the population inside its municipal boundaries.
Also try this if you also report state totals.
Some population statistics websites publish state population totals that are accurate. But if you add up the populations of all the cities and towns reported on those same websites, you can end up with a total that is significantly smaller than the state's actual population.
Why?
Because millions of people live outside incorporated city and town boundaries while still being part of the communities associated with those cities.
So go ahead.
Pick a state, say NC for example. Add up the populations of all the cities and towns you report. Then compare that total with the state's actual population you report.
The difference is the problem I'm talking about.
Population Data
More Examples
These examples show how dramatically population figures can change depending on whether you look at official town limits or the broader ZIP code area surrounding the community.
Troutman, North Carolina
Inside Town Limits
4,400
ZIP Code 28166
11,875
Statesville, North Carolina
Inside Town Limits
31,963
ZIP Codes 28625, 28677 & 28687
74,322
Ocean Isle Beach, North Carolina
Inside Town Limits
867
ZIP Code 28469
10,404
Shallotte, North Carolina
Inside Town Limits
5,335
ZIP Code 28470
11,219
You Get the Idea
The census data that cities report - and that you see on most census websites - only reflects the population within the official boundaries that the town or city has established. It often does not include the surrounding rural areas that are still considered part of the same community and may contain numerous subdivisions, businesses, and other residents.
That can be very misleading because simply looking at the population within a city's official borders does not necessarily represent the true population of the area. For example, as noted, if you add up the populations of all the cities in the region and assume that gives you an accurate total, you would be mistaken.
There are many people who live in what is considered that city or community but fall outside the specific boundaries used by the Census Bureau for reporting purposes.
As a result, the numbers can be significantly skewed and make an area appear much less populated than it actually is.
Why the distinction matters
When comparing population figures between communities, it is important to understand exactly what geographic area the number represents. A town-limit population and a ZIP-code population are measuring two very different areas-and treating them as if they are the same can create a misleading picture of how many people actually live in a community.
With that said, there are some cities where ZIP codes overlap into neighboring cities. That does not occur in this Mooresville example, but I read it does in some of the larger cities. It seems like there really needs to be a better way to accurately calculate the total population of an entire city. Here's another example from AI when I asked for the population of Mooresville, including all ZIP codes.
My question: Population of Mooresville, NC including all zip codes
If by Mooresville, NC including all ZIP codes you mean the population of the areas served by the Mooresville ZIP code, not just the incorporated Town of Mooresville, the number is substantially larger.
Mooresville ZIP-code population
Using the latest 2024 ACS 5-year estimates available for the ZIP Code Tabulation Areas (ZCTAs):
| ZIP code | 2024 population |
|---|---|
| 28115 | 43,544 |
| 28117 | 48,826 |
| 28123 | PO Box ZIP - no separate residential population |
| Combined 28115 + 28117 | 92,370 |
The Census Bureau identifies 28115 and 28117 as the two Mooresville ZCTAs.
The 2024 ACS figures are 43,544 for 28115 and 48,826 for 28117.
Important distinction
The Town of Mooresville itself is much smaller geographically and had an estimated 55,842 residents as of July 1, 2025. The 2020 Census count was 50,193. C Census.gov
So, depending on what you're trying to measure:
- Town of Mooresville: 55,842 (2025 estimate)
- Mooresville ZIP areas 28115 + 28117: 92,370 (2024 ACS)
- ZIP 28123: primarily a P.O. Box ZIP, so it shouldn't simply be added as another residential population. Z ZIP-Codes.com
For market sizing, advertising, or estimating the population of the broader Mooresville mailing area, I'd use approximately 92,000 people.