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Web design and SEO in St. Clair County, IL
Websites, local SEO and AI search for small businesses in St. Clair County, including Belleville, O'Fallon and East St. Louis. Plans start at $199 a month with no setup fee, and your site launches in 3 to 6 weeks.
Who we build for in St. Clair County
Utilities
A good site has to make service requests and emergency contacts easy to find.
Public Administration
A good site has to make forms, hours and contacts easy to find.
Professional Services
A good site has to show your credentials and make booking a consultation easy.
What St. Clair County's numbers mean for your website
20.9% of St. Clair County residents are 18 to 34 and 16.8% are 65 or older.
Nationally, 97% of adults under 30 and 78% of adults 65 and older own a smartphone (Pew Research Center, 2025).
Every plan includes custom design (mobile-first) and tap to call on every page, and every site meets Lighthouse 95+ performance at launch.
Median household income in St. Clair County is about $74,000.
Nationally, 96% of adults in households earning $70,000 to $99,999 own a smartphone, and 88% have home broadband (Pew Research Center, 2025).
We build light pages that load fast on a phone or a slower connection. Online estimate requests are included in every plan.
St. Clair County has 7 cities of 5,000 or more people, including Belleville, O'Fallon and East St. Louis.
Nationally, 46% of consumers always or often add "near me" to local searches (BrightLocal, 2025).
Service-area pages for your main cities count toward your page budget. Page budgets by plan.
Source: U.S. Census Bureau, American Community Survey 5-year estimates.
Client work near St. Clair County
Featured sites we built for businesses in this area, with the plan each one is on.
| Client | Plan | Lighthouse after launch |
|---|---|---|
| Stucky's Garage DoorsGarage door repair | Stand Up | 97 performance, 100 SEO |
| B. Woody's Tree ServiceTree service | Stand Up | 96 performance, 100 SEO |
| Archer SpacesHome organization | Stand Up | 99 performance, 100 SEO |
What you get in St. Clair County
- Plans from
- $199/mo on a 2-year term
- Setup fee
- None
- Launch
- 3 to 6 weeks
Hosting, SSL and monthly maintenance are included, with up to 8 content pages on the lowest plan. Site design licensed. Domain and content owned by client.
Will it pay for itself?
About the St. Clair County market
Whether you run a defense technology firm near Scott Air Force Base or a professional services business in Belleville, St. Clair County's economy is shaped heavily by military activity. Scott AFB, home to U.S. Transportation Command and Air Mobility Command, employs military and civilian personnel and supports contracts and a supply chain that reach across Illinois.
Whether you run a healthcare practice in O'Fallon or a medical staffing business in Belleville anywhere across St. Clair County, you're in a market anchored by two major health systems. HSHS Saint Elizabeth's Hospital opened a new state-of-the-art medical campus in St. Clair County, and Memorial Hospital East serves the eastern corridor, together employing healthcare workers and driving consistent demand for every physician practice, home health agency, and medical supplier in the county.
Whether you run a retail business in Fairview Heights or a restaurant in Shiloh anywhere across St. Clair County, you're benefiting from direct access to the bi-state St. Louis metro market just across the Mississippi River. Fairview Heights is a retail destination for southwestern Illinois, drawing cross-river shoppers from Missouri, and the O'Fallon and Shiloh corridor has become a commercial strip in the St. Louis metro, with new dining, fitness, and service businesses opening as residential development continues to push eastward from Scott Air Force Base.
St. Clair County, Illinois, is across the river from St. Louis and holds seven cities with 5,000 or more residents. Belleville is the largest at 41,370, followed by O'Fallon (32,262), East St. Louis (17,999), Fairview Heights (16,745), Swansea (14,710), Shiloh (14,572) and Mascoutah (8,816). The county has about 253,694 residents. The cities differ a lot, from the retail corridor around Fairview Heights to the historic downtown of Belleville and the growing suburbs near O'Fallon and Shiloh.
Retail trade has the most business establishments here, then healthcare, other services, hospitality and food, construction and professional services. Household incomes sit in the middle of the counties we serve, around 74,000, and the poverty rate is higher than in most of them, so a business with a broad customer base may want a site that is clear about value and easy to use on a phone. Homeownership is about 68 percent. Utilities pay the highest median earnings in the county, with public administration and professional services behind it.
Being across the river from St. Louis gives a business here a choice: stay tightly local to Belleville or Swansea, or reach toward St. Louis County, St. Charles County, the city itself and Madison County. We have built websites for home-service companies in the same metro, including Stucky's Garage Doors in Wentzville and B. Woody's Tree Service in St. Charles. For St. Clair County owners we write pages that name the real cities, fit the Google Business Profile to the site, and make the content easy for AI search tools to read and quote correctly.
- Population
- 253,694
- Metro area
- St. Louis
- ZIP codes served
- 16
- Highest-earning industry
- Utilities
Source: U.S. Census Bureau, American Community Survey 5-year estimates. Sources for each figure are listed under the full market data.
Full market data
Local market data
St. Clair County, IL. Census and industry figures, each with its source.
| Measure | St. Clair County |
|---|---|
| People and households, St. Clair County | |
| Population1 | 253,694 |
| Median household income12 | About $74,000 |
| Households that own their home1 | 68% |
| Median age1 | 39.5 |
| Cities of 5,000+1 | 7 |
| ZIP codes we serve3 | 16 |
| Metro | |
| Metro area1 | St. Louis, MO-IL |
| Metro population1 | 2,810,850 |
| Median earnings by industry, St. Clair County | |
| Utilities1 | $108,857 |
| Public Administration1 | $77,721 |
| Professional Services1 | $74,715 |
- 1.U.S. Census Bureau, American Community Survey 5-year estimates (latest release in our data, 2023 to 2024), via Data USA.
- 2.Median household income is our estimate from the census household income brackets: the bracket holding the middle household, interpolated within that bracket.
- 3.ZIP codes linked to the county's cities in the Census ZIP Code Tabulation Area relationship files.
ZIP codes we serve in St. Clair County
62203, 62207, 62220, 62221, 62223, 62226, 62243, 62201, 62204, 62205, 62208, 62232, 62225, 62254, 62258, 62269
Cities we serve in St. Clair County
We work with businesses in every community of 5,000 or more people in St. Clair County, IL, and the smaller communities around them.
- Belleville
- O'Fallon
- East St. Louis
- Fairview Heights
- Swansea
- Shiloh
- Mascoutah
Questions from St. Clair County, IL
Which St. Clair County cities could a business name on its website?
St. Clair County has 7 cities of 5,000 or more residents. Belleville has 41,370, O'Fallon 32,262, East St. Louis 17,999 and Fairview Heights 16,745, with Swansea, Shiloh and Mascoutah behind them. A site can list the cities a business really serves.
How does St. Clair County fit into the St. Louis metro for local search?
St. Clair County is part of the St. Louis metro, which has 2,810,850 residents. A site can state clearly that a business serves St. Clair County and name the cities. That makes it easier for searchers to see where you work.
Have you built websites near St. Clair County?
Our nearest project is Stucky's Garage Doors in Wentzville, MO, in the St. Louis metro. We have also built B. Woody's Tree Service in St. Charles, MO and Archer Spaces in St. Charles and St. Louis County, MO. These show how a local service business can present itself in the metro.
What sectors have the most businesses in St. Clair County?
The county counts 4,988 business establishments (2022). Retail Trade has 779, Healthcare 634, Other Services 573 and Hospitality & Food 565. A site that names its services and cities can make a business easier to pick in any of them.
Other counties in the St. Louis metro
| County | Population |
|---|---|
| St. Louis County, MO | 995,569 |
| St. Charles County, MO | 414,535 |
| St. Louis city, MO | 288,512 |
| Madison County, IL | 264,238 |
| Jefferson County, MO | 229,458 |
Get a bid for your St. Clair County business
Pick a plan and the features you need in the bid builder. We built Stucky's Garage Doors in Wentzville, MO, in the St. Louis metro. Stand Up and Growth have fixed prices, so your bid is instant. Custom work is reviewed by Chris, who gets in touch to talk it through.
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