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St. Clair County, IL · GEO Services
GEO Services for St. Clair County Businesses in a Shrinking Market
AI assistants answer local questions directly, and what they say depends on what they can verify. St. Clair County is losing residents. That is the context for answer engine optimization (AEO) in St. Clair County with GetPhound: audited business data, schema markup, conversational local content and monthly monitoring, included in Organic Growth.
Market at a glance
How Contested Are the Recommendation Categories in St. Clair County?
AI Answer Competition Index
62.0/ 100
Ranked 434 among the 1,822 counties above 20,000 residents, and 265 within our own 400-market set. The higher the score, the more established businesses there are for each answer to choose between. The method behind the score
Think of the index as a headcount of established competition, those with five or more employees, in eleven recommendation categories, for each 10,000 residents and compared across every county of 20,000 or more people. The categories are law, dental, medical, real estate, insurance, accounting, remodeling, plumbing and HVAC, roofing, electrical and auto repair. St. Clair County scores 62.0, which is near the middle of the pack.
Beyond the score, St. Clair County is a county where the headcount is flat or falling and a county made up of many sizeable towns. Each measure below places it among all counties.
- Change in the number of residents since the 2020 Census -2.5% Slow-growing: 8th percentile
- County median for household income (2023 est.) $66,007 Near the middle: 49th percentile
- Established competitors per 10,000 residents 11.9 Near the middle: 57th percentile
- Share of advice-led locations with 5+ employees 38.6% Big share: 63rd percentile
- Larger firms: share of locations with 20+ employees 6.3% High proportion: 85th percentile
- How the advice-led field moved, 2017 to 2022 -4% Trails most: 23rd percentile
- Cities and towns above 2,500 people 15 Many towns: 96th percentile
- 2025 building approvals per 10,000 people 17.2 Light building: 32nd percentile
Each percentile places St. Clair County among the 1,822 counties of 20,000 or more residents, as the share of them with a lower value. Drawn from: Census Bureau population estimates, County Business Patterns for 2017 and 2022, income estimates from the Census Bureau and the Building Permits Survey.
What stands out
Keeping Customers When St. Clair County Is Losing Residents
St. Clair County has lost 2.5% of its population since the 2020 Census and now has 251,018 residents. When a market shrinks, the customers who remain are the ones each competitor wants, and being described accurately and favorably when an assistant is asked is part of keeping them.
Two more details round out the picture. St. Clair County has 15 communities above 2,500 residents, 7 of them above 10,000, more than 96% of counties. 6.3% of the advice-led locations in St. Clair County have 20 or more employees, more than in 85% of counties.
What this means for GEO in St. Clair County: with the population falling, the goal is to hold your share of the households that remain.
No single place dominates St. Clair County: the largest, Belleville, has about 16% of residents, and others include O'Fallon (31,968), East St. Louis (17,642), Cahokia Heights (17,114) and Fairview Heights (16,125). An assistant asked about a service in one of them draws on local detail for that town, not for the whole county.
20% of the county, about 50,146 people, lives outside any named place, where "near me" and county-wide questions count for as much as a city name.
Housing demand
St. Clair County Permits Have Fallen From Their 2022 Peak and Still Slowing This Year
Bars show new housing units approved by building permits. Data: Building Permits Survey, county annual files, and a like-for-like year-to-date comparison. Permits mark intent to build, not finished construction.
From a high of 852 units in 2022, approvals in St. Clair County dropped to 433 in 2025, about 49% less, and the 2025 rate of 17.2 per 10,000 residents is below 68% of counties. Through the first eight months of 2026, 301 units were approved against 358 in the same months of 2025 (-15.9%).
The construction-linked categories with the most established competitors in St. Clair County are residential remodelers (1.1x typical) and insurance agencies (0.8x typical). New households arrive without providers they trust, and a business whose details already match across the places AI engines read is easier for them to find described.
The field an answer chooses from
Which St. Clair County Categories Have the Most Established Competitors
The eleven rows are the recommendation categories. Each shows established locations in St. Clair County and sets them against the median county, so 2.0x would mean twice the typical number per resident.
Business typeEstablished locationsCompared with a typical countyAll-location change, 2017 to 2022Locations with 20+ staff
Roofing contractors 11 +28.6% 3
Law officesDensest 44 -15.2% 8
Physicians and medical practicesBiggest employers 75 +14.3% 25
Residential remodelers 16 +9.9% 0
Accountants and CPA firms 15 -12.5% 4
Auto repair shops 24 -12.8% 0
Dentists 56 -11.5% 0
Insurance agencies 19 -14.4% 0
Real estate agents and brokersFastest growth 4 +16.3% 0
Plumbing and HVAC contractorsMost open 22 -6.2% 9
Electrical contractors 12 +0% 0
Bars give each category's established locations (five or more employees) per 10,000 residents as a multiple of the middle county among those ranked; the dark tick is 1.0x. Change is measured on all locations in the category, not just established ones. Counts come from County Business Patterns (2017, 2022) and are no measure of AI mentions or search volume. See the method
Law offices are the most contested category in St. Clair County: 44 established locations, 2.4 times the density of a typical county, with the category as a whole down 15.2% since 2017. A person asking an assistant which law firm to call has the most names to sort through here. Denser than usual as well: physicians offices (75 established locations, 1.4x) and residential remodelers (16 established locations, 1.1x). Room exists in plumbing, heating and air-conditioning contractors, where 22 established locations come to just 0.7x a typical county.
Real estate agents and brokers added the most new competition, 16.3% more locations of all sizes than in 2017 (57 now). Law offices contracted by 15.2% since 2017, to 123 locations. Physicians offices account for the most large employers, with 25 locations at 20 or more employees.
Remember what a count can and cannot say. It tells you how many established businesses are in each category. It says nothing about AI mentions, search volume or timing, and nobody can promise a mention in an AI answer.
Comparable counties
Six Markets Built Like St. Clair County
Of the 400 markets we cover, these six sit nearest St. Clair County on size, income, index score, firm size, growth and established share. Use them as context when you weigh AI search optimization for St. Clair County businesses.
| Look-alike | Score (0 to 100) | Population (2023) | Population trend since 2020 | How advice-led locations changed since 2017 | Locations with 20+ employees |
|---|---|---|---|---|---|
| St. Clair County, IL (this market) | 62.0 | 251,018 | -2.5% | -4% | 6.3% |
| Yakima County, WA | 60.8 | 256,643 | 0% | +3.3% | 6.4% |
| Atlantic County, NJ | 68.6 | 275,213 | +0.2% | -5.1% | 6.4% |
| Sangamon County, IL | 68.9 | 193,491 | -1.5% | -4.1% | 6.2% |
| Winnebago County, IL | 65.2 | 280,922 | -1.5% | +2.4% | 5.7% |
| Lackawanna County, PA | 67.4 | 216,123 | +0.1% | +1.6% | 5.6% |
| Harrison County, MS | 58.3 | 210,612 | +1% | -0.8% | 5.5% |
These six markets, out of 400, match this one most closely on size, income, score, firm size, growth and established share. Data sources are the same as above.
St. Clair County (62.0) looks most like Yakima County, WA, which scores 60.8. At the other extreme sits Sangamon County, IL, scoring 68.9. Harrison County, MS has 5.5% of its advice-led locations at 20 or more employees against 6.3% in St. Clair County. Treat the match as a read on the competition, not a promise about results.
Where the customers are
The Towns and Cities of St. Clair County, by Population
Population by place, from the Census Bureau's latest estimates. Local questions generally name a town, so each of these is a separate context, and work on answer engine optimization (AEO) in St. Clair County can be written for any of them.
| Community | Percent of all county residents | People (2023 estimate) |
|---|---|---|
| Belleville | 16% | 40,726 |
| O'Fallon | 13% | 31,968 |
| East St. Louis | 7% | 17,642 |
| Cahokia Heights | 7% | 17,114 |
| Fairview Heights | 6% | 16,125 |
| Shiloh | 6% | 14,736 |
Population numbers come from Census Bureau estimates. A place can be a city, a town or a census-designated place, and a city shared with a neighboring county appears with just the St. Clair County portion.
What happens, in order
How We Set Up AI Search Optimization for St. Clair County Businesses
Audit first
We review your NAP details and your site details across Google, Apple Maps, Yelp and the other listings AI engines read, so every source tells the same story.
Add the schema
We implement schema markup on the pages that matter most: LocalBusiness, FAQ and Review schema, so AI engines can read your details as structured facts.
Publish AI content
We produce conversational, hyper-local content that speaks to what your customers actually ask about your services and the places you serve.
Monitor every month
Each month we measure your visibility across ChatGPT, Perplexity and Google AI Overviews, then adjust the plan to the results. You see local rankings, AI visibility, citations, knowledge panels and platform traffic.
The parts of GEO
What GEO Services Cover for St. Clair County Businesses
Listings that agree
Your name, address and phone number are made to match across Google, Apple Maps, Yelp and the other places AI engines look.
AI-ready local content
We publish conversational, hyper-local content that answers the questions people put to assistants about your services, focused on St. Clair County first and foremost.
Review management
Engines look at how many reviews you have and how customers feel about you; we help you collect and respond to them consistently.
Technical foundation
The groundwork is technical SEO: pages that load, can be crawled and carry the structure the rest of GEO adds to.
Testing across AI engines
Monthly tests across AI Overviews, ChatGPT and Perplexity feed a report covering citations, AI visibility, knowledge panels, platform traffic and local rankings.
None of this stands alone: it is part of Organic Growth, with local SEO and Google Maps work beside it and a managed website on Gold and Platinum. Want leads sooner? We also manage Meta (Facebook and Instagram), Bing and Google ads.
Try your own figures
Is Generative Engine Optimization in St. Clair County Worth It? Run Your Own Numbers
The plans are flat monthly fees, which makes the payback arithmetic simple: what one new customer is worth to you, your margin and your close rate give the customers a month a plan has to deliver.
Monthly plans
St. Clair County GEO Pricing: Included in Every Organic Growth Plan
GEO comes inside the Organic Growth plans, not as a separate purchase. There is no setup fee and no contract on any plan. Talk to our CEO about the options.
Common questions
St. Clair County GEO: Frequently Asked Questions
How much does GEO cost in St. Clair County?
GEO is not sold on its own: every Organic Growth plan includes it. Silver is $1,495 a month, Gold is $2,495 and Platinum is $3,495, and Gold and Platinum add a fully managed, custom-built website. There is no setup fee and no contract.
Will GEO require rebuilding my website?
Usually not. The work begins by auditing your business information and adding structured data to the key pages you already have. If you would rather start fresh, the Gold and Platinum plans include a fully managed, custom-built website with hosting and maintenance.
Is St. Clair County a competitive market for AI answers?
On our measure, St. Clair County sits close to the middle of the pack: it scores 62.0, which is 434th out of 1,822 counties of 20,000 or more people and 265th of our 400 markets. The busiest category is law offices, at 2.4x a typical county. The score describes the number of established competitors; what engines do with them is beyond what public data can show.
Is there a contract or a setup fee?
No contract and no setup fee: plans are flat-rate and month to month. We also work with one business per category in each city, so we will not set you up against a direct competitor of yours in St. Clair County.
How long does GEO take to work in St. Clair County?
There is no honest timeline, and we will not invent one. Engines gather, validate and favor consistent information over time, and the outcome depends on your data, your category (law offices are 2.4x typical in St. Clair County) and what engines already know. Each month we test visibility and adjust the work.
Can you promise an AI mention for my business?
We cannot promise that, and neither can anyone else. No one controls what an AI engine says. Our work is to make what engines can find about you accurate, consistent and well structured, and over time engines gather, validate and favor consistent information. There is no timeframe to quote; we check Google AI Overviews, ChatGPT and Perplexity every month and report what we see.
Which cities in St. Clair County would the local content cover?
The ones you serve. St. Clair County has 15 places of 2,500 or more residents, led by Belleville, O'Fallon, East St. Louis, Cahokia Heights and Fairview Heights. The GEO content is hyper-local, and RankGuarantee™ landing pages (the monthly volume depends on whether you choose Silver, Gold or Platinum) give each service its own page in each place you cover.
What is GEO, and how is it different from SEO?
These names mostly mean the same thing: generative engine optimization, answer engine optimization and AI search optimization all describe preparing your business for engines that answer directly, such as Perplexity, ChatGPT and Google AI Overviews. The engines rely on structured data, listings and trusted content, which is why GEO works with SEO and not against it.
Is GEO the same as advertising on ChatGPT?
No. GEO is the unpaid side: helping engines find accurate information about your business. ChatGPT advertising is a separate, paid test: labeled, sponsored ads that some users on the Free and lower-priced plans see, set up in a self-serve Ads Manager and aimed by country and context rather than keyword. The ads do not alter the answers, and measurement is still maturing.
Close by
Beyond St. Clair County: The Closest Markets
Closest to St. Clair County, by distance between county centers, are these counties:
- Monroe County, IL (19 miles away; 34,957 people; AACI 48.4)
- St. Louis, MO, 21 miles from St. Clair County, 281,754 residents, index score 63.6
- Madison County, IL, 25 miles from St. Clair County, 262,752 residents, index score 65.1
- Clinton County, IL, 29 miles from St. Clair County, 36,785 residents, index score 55.0
Sources and method
Sources Behind the St. Clair County Numbers
Public Census Bureau data is the only source behind this page, worked out identically for each county, which keeps the comparison with St. Clair County fair. No client account data goes into this page, and nothing here measures how frequently an assistant mentions anyone.
- Last updatedOctober 19, 2026
- SourcesBusiness counts: County Business Patterns, 2017 and 2022. Population: Census estimates, 2023. Income: SAIPE, 2023. New-home permits: Building Permits Survey, 2021 through 2026 year to date.
- How the index worksThe AI Answer Competition Index and the other measures on this page are defined on the method page. You can browse every market in the index.
- CorrectionsIf a number looks wrong, email hello@getphound.com so we can trace the figure back to its Census table.
Talk to Us
Ready to Start St. Clair County GEO?
Share what you do and where in St. Clair County your customers are. We will walk through what the audit would look at and which plan fits. Call 610-825-4363 or email hello@getphound.com to set up a strategy session with our CEO.