Auto · County · Illinois
Car washes and detailers in Williamson County, IL
How Williamson County, IL compares with other counties and the U.S. for car washes and detailers: competitors, household spending, official counts and growth.
Groundwork market score · out of 100
Score 31 out of 100: Lower middle
Ranked #1,185 of 1,451 scored counties
#35 of 54 scored counties in Illinois
- Listings
- 15
- 5 chain locations (33%)
- Official establishments
- 9
- Businesses with payroll, 2023
- Household spending a year
- $29.6M
- On vehicle maintenance and repairs · $1,021 a household
- Spending per listing
- $2M
- 22% below the U.S.
- Listings per 10k households
- 5.2
- 37% above the U.S.
- Population, 2025
- 67,225
- +0.2% since 2020
See the car washes and detailers around any address in Williamson 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 Williamson 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
Williamson County scores 31 (lower middle) on the Groundwork market score for car washes and detailers, ranking #1,185 of 1,451 scored counties and #35 of 54 scored counties in Illinois. That puts it in the bottom quarter of counties.
Household spending on vehicle maintenance and repairs in Williamson County comes to about $29.6M a year: $1,021 per household, 7% above the U.S. average. That works out to $2M per location, 22% below the U.S. figure of $2.5M. The spending figure covers all vehicle maintenance and repairs, not only car washes and detailers.
Williamson County has 15 car washes and detailers on map listings as of September 2026. 5 of them (33%) are chain locations, against 23% across the U.S. Per 10,000 households, that is 5.2, 37% above the U.S. rate of 3.8.
The official count of businesses with payroll classed as car washes in Williamson County was 9 in 2023. That is one for every 3,220 households, against one for every 6,523 across the U.S. Population estimates put the population change in Williamson County from 2020 to 2025 at +0.2%, slower than the U.S. (+3.1%).
How Williamson 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 | Williamson County | Illinois | U.S. |
|---|---|---|---|
| Listings per 10k households | 5.2 | 3.6 | 3.8 |
| Spending per listing | $2M | $2.7M | $2.5M |
| Households per official establishment | 3,220 | 6,432 | 6,523 |
| Official establishment growth, 2019–2023 | n/a | +8.6% | +16.7% |
| Population growth, 2020–2025 | +0.2% | −0.6% | +3.1% |
| Spending per household on vehicle maintenance and repairs | $1,021 | $975 | $958 |
| Median household income | $65,604 | $83,390 | $80,734 |
| Groundwork market score | 31 | 46 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 7 → 9
- Employees, 2023
- 34
- Annual payroll, 2023
- $925K
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 155 chain locations
- Listings at the U.S. rate for this spending
- 12The 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 Williamson 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 Williamson County
- Population, 2025 estimate
- 67,225+0.2% since 2020
- Households
- 28,983
- Median age
- 42.8
- Homes lived in by their owners
- 71%
- Vehicles per household
- 1.8
- Land area
- 420 sq. mi.
- People per square mile
- 159
- Median household income
- $65,604+29.3% vs. 2015–2019, before inflation
- Average household income
- $85,846
- Median home value
- $156,400
- Jobs located here
- 28,604
- Daytime population
- 68,042Residents who don’t work, plus everyone whose job is here
Looking at a specific site in Williamson 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 Williamson 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 Williamson 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 |
| 35Williamson County, IL | 31 | 15 | 5.2 | $2M | +0.2% | #1,185 of 1,451 |
Other business types in Williamson 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 care52
- Auto repair shops57
- Collision repair and body shops52
- Car washes and detailing31
- Tire shops60
- Oil change and quick lube
- Gas stations53
- Insurance agencies16
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 Williamson County, IL?
Map listings as of September 2026 show 15 car washes and detailers in Williamson County. 5 of them (33%) are chain locations. The listings count car washes and detailers. Official counts show 9 businesses with payroll classed as car washes in 2023.
How much do households in Williamson County, IL spend on vehicle maintenance and repairs?
About $29.6M a year, or $1,021 per household. That is 7% above the U.S. average (an index of 107, where 100 is the U.S. average). Spread across the 15 car washes and detailers on map listings, it comes to $2M per location. That spending covers all vehicle maintenance and repairs, which car washes and detailers share with other businesses in the trade. It is estimated from the incomes of the 28,983 households in Williamson County and national spending patterns by income.
How does Williamson County, IL compare with the U.S. for car washes and detailers?
Williamson County has 5.2 car washes and detailers per 10,000 households, 37% above the U.S. rate of 3.8. Spending per location is $2M, 22% below the U.S. figure of $2.5M. At the U.S. ratio of car washes and detailers to household spending, Williamson County would have about 12, against 15 on map listings. There is one business with payroll in the industry for every 3,220 households, against one for every 6,523 across the U.S.
How fast is Williamson County, IL growing?
Population estimates put Williamson County at 67,225 people in 2025, up 0.2% since 2020, slower than the U.S. (+3.1%). It has 28,983 households. The median household income in Williamson County is $65,604 a year, 19% below the U.S. median of $80,734. That rose 29.3% from the 2015–2019 survey, 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. Williamson County scores 31 for car washes and detailers (lower middle), #1,185 of 1,451 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in Williamson 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 Williamson County
Screening a site or an acquisition in Williamson 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 Williamson 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.