Home services · County · Illinois
HVAC and plumbing companies in Williamson County, IL
The HVAC and plumbing companies in Williamson County, IL, the household spending behind them and how the market ranks against other counties.
Groundwork market score · out of 100
Score 36 out of 100: Lower middle
Ranked #1,328 of 1,707 scored counties
#30 of 59 scored counties in Illinois
- Listings
- 19
- 0 chain locations (0%)
- Official establishments
- 28
- −6.7% since 2019
- Household spending a year
- $73.4M
- On home repairs, maintenance and insurance · $2,533 a household
- Spending per listing
- $3.9M
- 19% below the U.S.
- Listings per 10k households
- 6.6
- 5% above the U.S.
- Population, 2025
- 67,225
- +0.2% since 2020
See the HVAC and plumbing companies around any address in Williamson County
The site report maps the HVAC and plumbing companies 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
The Groundwork market score for HVAC and plumbing companies in Williamson County is 36 (lower middle), #1,328 of 1,707 scored counties and #30 of 59 scored counties in Illinois. That puts it in the bottom quarter of counties.
Map listings as of September 2026 show 19 HVAC and plumbing companies in Williamson County. None of them are chain locations, against 4% across the U.S. That is 6.6 per 10,000 households, 5% above the U.S. rate of 6.3.
Households in Williamson County spend about $73.4M a year on home repairs, maintenance and insurance, or $2,533 per household, 16% below the U.S. average. Spread across 19 HVAC and plumbing companies, that is $3.9M per company, 19% below the U.S. figure of $4.8M. That spending covers all home repairs, maintenance and insurance, which HVAC and plumbing companies share with other businesses in the trade.
The official count of businesses with payroll classed as plumbing, heating and air-conditioning contractors in Williamson County was 28 in 2023, down 6.7% from 2019. That is one for every 1,035 households, against one for every 1,162 across the U.S. Since fiscal 2022, 2 SBA-backed loans worth $1.7M have gone to businesses classed as plumbing, heating and air-conditioning contractors in Williamson County. Between 2020 and 2025, the population of Williamson County grew 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 home repairs, maintenance and insurance by the HVAC and plumbing companies 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 | 6.6 | 6.9 | 6.3 |
| Spending per listing | $3.9M | $4.2M | $4.8M |
| Households per official establishment | 1,035 | 1,237 | 1,162 |
| Official establishment growth, 2019–2023 | −6.7% | −0.3% | +7.6% |
| Population growth, 2020–2025 | +0.2% | −0.6% | +3.1% |
| Spending per household on home repairs, maintenance and insurance | $2,533 | $2,919 | $3,018 |
| Median household income | $65,604 | $83,390 | $80,734 |
| Groundwork market score | 36 | 40 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 30 → 28−6.7% over the period
- Employees, 2023
- 258
- Annual payroll, 2023
- $16.4M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 190 chain locations
- Listings at the U.S. rate for this spending
- 15The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 2
- Amount
- $1.7M
SBA-backed loans to businesses classed as plumbing, heating and air-conditioning contractors 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 HVAC and plumbing companies 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 cardHVAC and plumbing across Illinois
Every Illinois market ranked →The highest-scoring counties in Illinois for HVAC and plumbing companies, 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 |
|---|---|---|---|---|---|---|
| 1Cook County, IL | 65 | 1,095 | 5.2 | $5.7M | −1.3% | #335 of 1,707 |
| 2Rock Island County, IL | 63 | 21 | 3.4 | $7.4M | −1.7% | #384 of 1,707 |
| 3Ogle County, IL | 63 | 11 | 5.3 | $5.2M | −0.7% | #395 of 1,707 |
| 4Henry County, IL | 62 | 8 | 3.9 | $6.8M | −2.2% | #409 of 1,707 |
| 5Franklin County, IL | 59 | 5 | 3.1 | $7.5M | −2.1% | #511 of 1,707 |
| 6St. Clair County, IL | 59 | 53 | 5.3 | $5.2M | −2.5% | #530 of 1,707 |
| 7Monroe County, IL | 57 | 10 | 7.2 | $4.4M | −0.3% | #613 of 1,707 |
| 8Sangamon County, IL | 56 | 46 | 5.4 | $5M | −1.0% | #635 of 1,707 |
| 9Champaign County, IL | 52 | 54 | 6.3 | $4.1M | +1.8% | #791 of 1,707 |
| 10Kendall County, IL | 52 | 48 | 10.6 | $3.1M | +9.9% | #802 of 1,707 |
| 30Williamson County, IL | 36 | 19 | 6.6 | $3.9M | +0.2% | #1,328 of 1,707 |
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
Beauty and personal care
Fitness and classes
Health care
Child care
Clothing and laundry
Home services
Real estate
Funeral services
Questions
How many HVAC and plumbing companies are in Williamson County, IL?
There are 19 HVAC and plumbing companies on map listings in Williamson County as of September 2026. None of them are chain locations. The listings count heating and air-conditioning companies and plumbers. Official counts show 28 businesses with payroll classed as plumbing, heating and air-conditioning contractors in 2023, down 6.7% from 2019.
How much do households in Williamson County, IL spend on home repairs, maintenance and insurance?
About $73.4M a year, or $2,533 per household. That is 16% below the U.S. average (an index of 84, where 100 is the U.S. average). Spread across the 19 HVAC and plumbing companies on map listings, it comes to $3.9M per company. The spending figure covers all home repairs, maintenance and insurance, not only HVAC and plumbing companies. 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 HVAC and plumbing companies?
Williamson County has 6.6 HVAC and plumbing companies per 10,000 households, 5% above the U.S. rate of 6.3. Spending per company is $3.9M, 19% below the U.S. figure of $4.8M. At the national ratio of HVAC and plumbing companies to household spending, Williamson County would have about 15, against 19 on map listings. There is one business with payroll in the industry for every 1,035 households, against one for every 1,162 across the U.S. The official count fell 6.7% from 2019 to 2023, against +7.6% for 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 36 for HVAC and plumbing companies (lower middle), #1,328 of 1,707 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 HVAC and plumbing companies 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 HVAC and plumbing companies · 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.