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HVAC and plumbing companies in St. Mary Parish, LA
Competitor counts, household spending and official business counts for HVAC and plumbing companies in St. Mary Parish, LA, set against other counties and the U.S.
Groundwork market score · out of 100
Score 42 out of 100: Lower middle
Ranked #1,129 of 1,707 scored counties
#18 of 37 scored counties in Louisiana
- Listings
- 9
- 1 chain location (11%)
- Official establishments
- 14
- Businesses with payroll, 2023
- Household spending a year
- $44.1M
- On home repairs, maintenance and insurance · $2,389 a household
- Spending per listing
- $4.9M
- 3% above the U.S.
- Listings per 10k households
- 4.9
- 22% below the U.S.
- Population, 2025
- 46,552
- −5.3% since 2020
See the HVAC and plumbing companies around any address in St. Mary Parish
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 St. Mary Parish. 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
At $2,389 per household (21% below the U.S. average), households in St. Mary Parish spend about $44.1M a year on home repairs, maintenance and insurance. That works out to $4.9M per company, 3% above the U.S. figure of $4.8M. The spending figure covers all home repairs, maintenance and insurance, not only HVAC and plumbing companies.
St. Mary Parish has 9 HVAC and plumbing companies on map listings as of September 2026. One of them (11%) is a chain location, against 4% across the U.S. Per 10,000 households, that is 4.9, 22% below the U.S. rate of 6.3.
In 2023, official counts showed 14 businesses with payroll in St. Mary Parish classed as plumbing, heating and air-conditioning contractors. That is one for every 1,319 households, against one for every 1,162 across the U.S.
Population estimates put the population change in St. Mary Parish from 2020 to 2025 at −5.3%, against +3.1% for the U.S. For HVAC and plumbing companies, St. Mary Parish has a Groundwork market score of 42 (lower middle): #1,129 of 1,707 scored counties and #18 of 37 scored counties in Louisiana.
How St. Mary Parish compares
The same measures for Louisiana 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 | St. Mary Parish | Louisiana | U.S. |
|---|---|---|---|
| Listings per 10k households | 4.9 | 6.7 | 6.3 |
| Spending per listing | $4.9M | $3.9M | $4.8M |
| Households per official establishment | 1,319 | 1,112 | 1,162 |
| Official establishment growth, 2019–2023 | n/a | +13.0% | +7.6% |
| Population growth, 2020–2025 | −5.3% | −0.7% | +3.1% |
| Spending per household on home repairs, maintenance and insurance | $2,389 | $2,650 | $3,018 |
| Median household income | $52,576 | $60,756 | $80,734 |
| Groundwork market score | 42 | 19 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 12 → 14
- Employees, 2023
- 46
- Annual payroll, 2023
- $2M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 91 chain location
- Listings at the U.S. rate for this spending
- 9The 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 plumbing, heating and air-conditioning contractors in St. Mary Parish, 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. Mary Parish
- Population, 2025 estimate
- 46,552−5.3% since 2020
- Households
- 18,463
- Median age
- 39.8
- Homes lived in by their owners
- 69%
- Vehicles per household
- 1.6
- Land area
- 559 sq. mi.
- People per square mile
- 86
- Median household income
- $52,576+29.9% vs. 2015–2019, before inflation
- Average household income
- $71,245
- Median home value
- $138,900
- Jobs located here
- 20,344
- Daytime population
- 47,916Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Mary Parish?
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 St. Mary Parish. 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 Louisiana
Every Louisiana market ranked →The highest-scoring counties in Louisiana for HVAC and plumbing companies, numbered among those based in Louisiana, with St. Mary Parish marked.
Top counties in Louisiana
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Ascension Parish, LA | 76 | 26 | 5.5 | $5.9M | +6.4% | #100 of 1,707 |
| 2West Baton Rouge Parish, LA | 75 | 6 | 5.5 | $5.2M | +5.5% | #125 of 1,707 |
| 3Orleans Parish, LA | 69 | 40 | 2.6 | $10.3M | −5.5% | #222 of 1,707 |
| 4St. Martin Parish, LA | 57 | 5 | 2.6 | $9.8M | −1.0% | #592 of 1,707 |
| 5Evangeline Parish, LA | 52 | 5 | 4.0 | $5.7M | −1.0% | #772 of 1,707 |
| 6Vermilion Parish, LA | 51 | 9 | 4.1 | $6M | +1.3% | #805 of 1,707 |
| 7De Soto Parish, LA | 50 | 5 | 4.8 | $5.1M | +2.0% | #847 of 1,707 |
| 8St. John the Baptist Parish, LA | 50 | 8 | 5.3 | $4.9M | −5.9% | #850 of 1,707 |
| 9Webster Parish, LA | 49 | 5 | 3.5 | $6.4M | −5.2% | #878 of 1,707 |
| 10East Baton Rouge Parish, LA | 48 | 126 | 7.1 | $3.9M | +0.1% | #930 of 1,707 |
| 18St. Mary Parish, LA | 42 | 9 | 4.9 | $4.9M | −5.3% | #1,129 of 1,707 |
Other business types in St. Mary Parish
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 St. Mary Parish, LA?
Map listings as of September 2026 show 9 HVAC and plumbing companies in St. Mary Parish. One of them (11%) is a chain location. The listings count heating and air-conditioning companies and plumbers. Official counts show 14 businesses with payroll classed as plumbing, heating and air-conditioning contractors in 2023.
How much do households in St. Mary Parish, LA spend on home repairs, maintenance and insurance?
About $44.1M a year, or $2,389 per household. That is 21% below the U.S. average (an index of 79, where 100 is the U.S. average). Spread across the 9 HVAC and plumbing companies on map listings, it comes to $4.9M per company. That spending covers all home repairs, maintenance and insurance, which HVAC and plumbing companies share with other businesses in the trade. It is estimated from the incomes of the 18,463 households in St. Mary Parish and national spending patterns by income.
How does St. Mary Parish, LA compare with the U.S. for HVAC and plumbing companies?
St. Mary Parish has 4.9 HVAC and plumbing companies per 10,000 households, 22% below the U.S. rate of 6.3. Spending per company is $4.9M, 3% above the U.S. figure of $4.8M. The count on map listings matches the U.S. ratio of HVAC and plumbing companies to household spending. There is one business with payroll in the industry for every 1,319 households, against one for every 1,162 across the U.S.
How fast is St. Mary Parish, LA growing?
Population estimates put St. Mary Parish at 46,552 people in 2025, down 5.3% since 2020, against +3.1% for the U.S. It has 18,463 households. Median household income in St. Mary Parish is $52,576, 35% below the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 29.9%, 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. Mary Parish scores 42 for HVAC and plumbing companies (lower middle), #1,129 of 1,707 scored counties.
How can I see the market around a specific site?
Run a Groundwork site report on an address in St. Mary Parish. 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 St. Mary Parish
Screening a site or an acquisition in St. Mary Parish?
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. Mary Parish. 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.