Auto · County · Missouri
Car washes and detailers in St. Charles County, MO
Competitor counts, household spending and official business counts for car washes and detailers in St. Charles County, MO, set against other counties and the U.S.
Groundwork market score · out of 100
Score 65 out of 100: Upper middle
Ranked #345 of 1,451 scored counties
#17 of 45 scored counties in Missouri
- Listings
- 76
- 26 chain locations (34%)
- Official establishments
- 32
- −13.5% since 2019
- Household spending a year
- $193.4M
- On vehicle maintenance and repairs · $1,199 a household
- Spending per listing
- $2.5M
- In line with the U.S.
- Listings per 10k households
- 4.7
- 24% above the U.S.
- Population, 2025
- 426,499
- +4.9% since 2020
See the car washes and detailers around any address in St. Charles 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. Charles 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
Households in St. Charles County spend about $193.4M a year on vehicle maintenance and repairs, or $1,199 per household, 25% above the U.S. average. Spread across 76 car washes and detailers, that is $2.5M per location, in line with the U.S. figure of $2.5M. The spending figure covers all vehicle maintenance and repairs, not only car washes and detailers.
St. Charles County has 76 car washes and detailers on map listings as of September 2026. Chain locations make up 34% of them, 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.
Official counts show 32 businesses with payroll classed as car washes in St. Charles County in 2023, down 13.5% from 2019. That is one for every 5,041 households, against one for every 6,523 across the U.S. Since fiscal 2022, 1 SBA-backed loan worth $317K has gone to businesses classed as car washes in St. Charles County.
Between 2020 and 2025, the population of St. Charles County grew 4.9%, faster than the U.S. (+3.1%). St. Charles County scores 65 (upper middle) on the Groundwork market score for car washes and detailers, ranking #345 of 1,451 scored counties and #17 of 45 scored counties in Missouri. That puts it in the top quarter of counties.
How St. Charles County compares
The same measures for Missouri 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. Charles County | Missouri | U.S. |
|---|---|---|---|
| Listings per 10k households | 4.7 | 4.2 | 3.8 |
| Spending per listing | $2.5M | $2.5M | $2.5M |
| Households per official establishment | 5,041 | 6,706 | 6,523 |
| Official establishment growth, 2019–2023 | −13.5% | +10.7% | +16.7% |
| Population growth, 2020–2025 | +4.9% | +1.9% | +3.1% |
| Spending per household on vehicle maintenance and repairs | $1,199 | $1,058 | $958 |
| Median household income | $104,692 | $70,702 | $80,734 |
| Groundwork market score | 65 | 52 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 37 → 32−13.5% over the period
- Employees, 2023
- 450
- Annual payroll, 2023
- $8.2M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 7626 chain locations
- Listings at the U.S. rate for this spending
- 77The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 1
- Amount
- $317K
SBA-backed loans to businesses classed as car washes in St. Charles 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. Charles County
- Population, 2025 estimate
- 426,499+4.9% since 2020
- Households
- 161,311
- Median age
- 40.8
- Homes lived in by their owners
- 81%
- Vehicles per household
- 2.0
- Land area
- 560 sq. mi.
- People per square mile
- 740
- Median household income
- $104,692+23.2% vs. 2015–2019, before inflation
- Average household income
- $129,305
- Median home value
- $320,800
- Jobs located here
- 167,185
- Daytime population
- 365,581Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Charles 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. Charles 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 Missouri
Every Missouri market ranked →The highest-scoring counties in Missouri for car washes and detailers, numbered among those based in Missouri, with St. Charles County marked.
Top counties in Missouri
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Lincoln County, MO | 94 | 8 | 3.5 | $3.6M | +11.4% | #3 of 1,451 |
| 2Warren County, MO | 92 | 5 | 3.6 | $3.6M | +9.2% | #6 of 1,451 |
| 3Jefferson County, MO | 86 | 30 | 3.4 | $3.5M | +2.7% | #28 of 1,451 |
| 4Christian County, MO | 85 | 12 | 3.4 | $3.5M | +8.3% | #37 of 1,451 |
| 5Platte County, MO | 85 | 18 | 4.1 | $2.9M | +6.7% | #38 of 1,451 |
| 6Cass County, MO | 82 | 20 | 4.6 | $2.7M | +7.1% | #51 of 1,451 |
| 7Johnson County, MO | 80 | 7 | 3.3 | $3.4M | +4.9% | #59 of 1,451 |
| 8Lawrence County, MO | 72 | 6 | 4.1 | $2.7M | +3.7% | #188 of 1,451 |
| 9Laclede County, MO | 71 | 5 | 3.4 | $3.1M | +2.5% | #205 of 1,451 |
| 10Franklin County, MO | 71 | 21 | 4.9 | $2.4M | +3.1% | #217 of 1,451 |
| 17St. Charles County, MO | 65 | 76 | 4.7 | $2.5M | +4.9% | #345 of 1,451 |
Other business types in St. Charles 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 care72
- Auto repair shops74
- Collision repair and body shops69
- Car washes and detailing65
- Tire shops83
- Oil change and quick lube50
- Gas stations81
- Insurance agencies28
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. Charles County, MO?
Map listings as of September 2026 show 76 car washes and detailers in St. Charles County. 26 of them (34%) are chain locations. The listings count car washes and detailers. Official counts show 32 businesses with payroll classed as car washes in 2023, down 13.5% from 2019.
How much do households in St. Charles County, MO spend on vehicle maintenance and repairs?
About $193.4M a year, or $1,199 per household. That is 25% above the U.S. average (an index of 125, where 100 is the U.S. average). Spread across the 76 car washes and detailers on map listings, it comes to $2.5M 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 161,311 households in St. Charles County and national spending patterns by income.
How does St. Charles County, MO compare with the U.S. for car washes and detailers?
St. Charles 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 $2.5M, in line with the U.S. figure of $2.5M. At the U.S. ratio of car washes and detailers to household spending, St. Charles County would have about 77, against 76 on map listings. There is one business with payroll in the industry for every 5,041 households, against one for every 6,523 across the U.S. The official count fell 13.5% from 2019 to 2023, against +16.7% for the U.S.
How fast is St. Charles County, MO growing?
Population estimates put St. Charles County at 426,499 people in 2025, up 4.9% since 2020, faster than the U.S. (+3.1%). It has 161,311 households. The median household income in St. Charles County is $104,692 a year, 30% above the U.S. median of $80,734. That rose 23.2% 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. St. Charles County scores 65 for car washes and detailers (upper middle), #345 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. Charles 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. Charles County
Screening a site or an acquisition in St. Charles 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. Charles 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.