Auto · County · Illinois
Car washes and detailers in St. Clair County, IL
The car washes and detailers in St. Clair County, IL, the household spending behind them and how the market ranks against other counties.
Groundwork market score · out of 100
Score 46 out of 100: Lower middle
Ranked #826 of 1,451 scored counties
#24 of 54 scored counties in Illinois
- Listings
- 47
- 7 chain locations (15%)
- Official establishments
- 15
- Businesses with payroll, 2023
- Household spending a year
- $104.1M
- On vehicle maintenance and repairs · $1,032 a household
- Spending per listing
- $2.2M
- 12% below the U.S.
- Listings per 10k households
- 4.7
- 24% above the U.S.
- Population, 2025
- 250,708
- −2.5% since 2020
See the car washes and detailers around any address in St. Clair County
The site report maps the car washes and detailers on map listings near the address, by name and distance, and sizes the households and spending around it. Or open the report at the center of St. Clair County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardSurvey estimates 2020–2024 · population estimates 2025 · official business counts 2023 · map listings September 2026 · Data credits · How we measure
What this means
As of September 2026, map listings count 47 car washes and detailers in St. Clair County. Of those, 7 are chain locations, or 15%, against 23% across the U.S. That comes to 4.7 for every 10,000 households, 24% above the U.S. rate of 3.8.
Households in St. Clair County spend about $104.1M a year on vehicle maintenance and repairs, or $1,032 per household, 8% above the U.S. average. That works out to $2.2M per location, 12% below the U.S. figure of $2.5M. That spending covers all vehicle maintenance and repairs, which car washes and detailers share with other businesses in the trade.
In 2023, official counts showed 15 businesses with payroll in St. Clair County classed as car washes. That is one for every 6,723 households, against one for every 6,523 across the U.S.
Between 2020 and 2025, the population of St. Clair County declined 2.5%, against +3.1% for the U.S. For car washes and detailers, St. Clair County has a Groundwork market score of 46 (lower middle): #826 of 1,451 scored counties and #24 of 54 scored counties in Illinois.
How St. Clair County compares
The same measures for Illinois and the whole U.S. Spending per listing divides a year of household spending on all vehicle maintenance and repairs by the car washes and detailers counted, so it measures the demand for each competitor, not any business’s revenue. Households per establishment does the same with the official count.
| Measure | St. Clair County | Illinois | U.S. |
|---|---|---|---|
| Listings per 10k households | 4.7 | 3.6 | 3.8 |
| Spending per listing | $2.2M | $2.7M | $2.5M |
| Households per official establishment | 6,723 | 6,432 | 6,523 |
| Official establishment growth, 2019–2023 | n/a | +8.6% | +16.7% |
| Population growth, 2020–2025 | −2.5% | −0.6% | +3.1% |
| Spending per household on vehicle maintenance and repairs | $1,032 | $975 | $958 |
| Median household income | $73,854 | $83,390 | $80,734 |
| Groundwork market score | 46 | 46 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 17 → 15
- Employees, 2023
- 187
- Annual payroll, 2023
- $3.8M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 477 chain locations
- Listings at the U.S. rate for this spending
- 41The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 0
- Amount
- $0
SBA-backed loans to businesses classed as car washes in St. Clair County, through June 2026, placed by the borrower’s ZIP code. Official establishments are businesses with payroll; the official counts leave out places with fewer than 3.
Population and households in St. Clair County
- Population, 2025 estimate
- 250,708−2.5% since 2020
- Households
- 100,846
- Median age
- 40.3
- Homes lived in by their owners
- 68%
- Vehicles per household
- 1.8
- Land area
- 658 sq. mi.
- People per square mile
- 386
- Median household income
- $73,854+33.8% vs. 2015–2019, before inflation
- Average household income
- $96,153
- Median home value
- $180,300
- Jobs located here
- 90,959
- Daytime population
- 229,240Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Clair County?
These figures cover the whole county. A site report draws rings around one address and counts what’s inside them: households, spending, jobs, and the car washes and detailers on map listings by name and distance.
Or open the report at the center of St. Clair County. Signed out, you see a blurred preview; on an account, each report is one action.
Free10 actions over 3 days, no cardCar washes and detailing across Illinois
Every Illinois market ranked →The highest-scoring counties in Illinois for car washes and detailers, numbered among those based in Illinois, with St. Clair County marked.
Top counties in Illinois
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Will County, IL | 79 | 94 | 3.8 | $3.3M | +2.2% | #66 of 1,451 |
| 2Kendall County, IL | 79 | 19 | 4.2 | $3.1M | +9.9% | #68 of 1,451 |
| 3Boone County, IL | 77 | 6 | 3.1 | $3.9M | +0.4% | #91 of 1,451 |
| 4Lake County, IL | 74 | 72 | 2.8 | $4.3M | +0.8% | #134 of 1,451 |
| 5Monroe County, IL | 63 | 5 | 3.6 | $3.5M | −0.3% | #381 of 1,451 |
| 6DuPage County, IL | 63 | 127 | 3.6 | $3.1M | +0.3% | #385 of 1,451 |
| 7Winnebago County, IL | 62 | 40 | 3.4 | $2.8M | −0.4% | #410 of 1,451 |
| 8Macoupin County, IL | 61 | 7 | 4.0 | $2.9M | −2.6% | #436 of 1,451 |
| 9Woodford County, IL | 60 | 6 | 4.1 | $3M | −0.8% | #456 of 1,451 |
| 10McHenry County, IL | 58 | 60 | 5.1 | $2.4M | +2.5% | #521 of 1,451 |
| 24St. Clair County, IL | 46 | 47 | 4.7 | $2.2M | −2.5% | #826 of 1,451 |
Other business types in St. Clair County
Each with its Groundwork market score here, out of 100, where it has one.
Food and drink
Groceries and convenience
Auto
- Auto repair and car care46
- Auto repair shops50
- Collision repair and body shops35
- Car washes and detailing46
- Tire shops54
- Oil change and quick lube41
- Gas stations54
- Insurance agencies22
Beauty and personal care
Fitness and classes
Health care
Child care
Clothing and laundry
Home services
Real estate
Funeral services
Questions
How many car washes and detailers are in St. Clair County, IL?
St. Clair County has 47 car washes and detailers on map listings as of September 2026. 7 of them (15%) are chain locations. The listings count car washes and detailers. Official counts show 15 businesses with payroll classed as car washes in 2023.
How much do households in St. Clair County, IL spend on vehicle maintenance and repairs?
About $104.1M a year, or $1,032 per household. That is 8% above the U.S. average (an index of 108, where 100 is the U.S. average). Spread across the 47 car washes and detailers on map listings, it comes to $2.2M per location. The spending figure covers all vehicle maintenance and repairs, not only car washes and detailers. It is estimated from the incomes of the 100,846 households in St. Clair County and national spending patterns by income.
How does St. Clair County, IL compare with the U.S. for car washes and detailers?
St. Clair County has 4.7 car washes and detailers per 10,000 households, 24% above the U.S. rate of 3.8. Spending per location is $2.2M, 12% below the U.S. figure of $2.5M. At the national ratio of car washes and detailers to household spending, St. Clair County would have about 41, against 47 on map listings. There is one business with payroll in the industry for every 6,723 households, against one for every 6,523 across the U.S.
How fast is St. Clair County, IL growing?
Population estimates put St. Clair County at 250,708 people in 2025, down 2.5% since 2020, against +3.1% for the U.S. It has 100,846 households. Median household income in St. Clair County is $73,854, 9% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 33.8%, before inflation.
What is the Groundwork market score?
The Groundwork market score runs from 0 to 100 and compares a market with others of its kind for one business type: states with states, metro areas with metro areas, small-town markets and counties with their own. It weighs household spending per competitor (35%), households per business with payroll (25%), population growth (20%) and spending power (20%), each ranked against those peers. A higher score means that, taken together, the market has more household spending and more households for each business already there, faster population growth and more spending per household than similar markets. It describes a market, not any one site or deal. St. Clair County scores 46 for car washes and detailers (lower middle), #826 of 1,451 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in St. Clair County. It maps the car washes and detailers on map listings near the site and sizes the households and spending within the distance you choose. New accounts get 10 actions over 3 days, no card.
How the score works · Top markets for car washes and detailers · All 56 business types in St. Clair County
Screening a site or an acquisition in St. Clair County?
A site report maps the competitors on map listings near an address and sizes the households and spending around it.
The button opens the report at the center of St. Clair County. Signed out, you see a blurred preview; on an account, each report is one action.
This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.
Figures are estimates for research only. Not investment or real estate advice.