Home services · County · Maryland
HVAC and plumbing companies in St. Mary’s County, MD
Competitor counts, household spending and official business counts for HVAC and plumbing companies in St. Mary’s County, MD, set against other counties and the U.S.
Groundwork market score · out of 100
Score 44 out of 100: Lower middle
Ranked #1,079 of 1,707 scored counties
#17 of 23 scored counties in Maryland
- Listings
- 46
- 1 chain location (2%)
- Official establishments
- 52
- −3.7% since 2019
- Household spending a year
- $154.4M
- On home repairs, maintenance and insurance · $3,639 a household
- Spending per listing
- $3.4M
- 29% below the U.S.
- Listings per 10k households
- 10.8
- 71% above the U.S.
- Population, 2025
- 116,692
- +2.4% since 2020
See the HVAC and plumbing companies around any address in St. Mary’s 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 St. Mary’s 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
At $3,639 per household (21% above the U.S. average), households in St. Mary’s County spend about $154.4M a year on home repairs, maintenance and insurance. Spread across 46 HVAC and plumbing companies, that is $3.4M per company, 29% below 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’s County has 46 HVAC and plumbing companies on map listings as of September 2026. One of them (2%) is a chain location, against 4% across the U.S. That is 10.8 per 10,000 households, 71% above the U.S. rate of 6.3.
Official counts show 52 businesses with payroll classed as plumbing, heating and air-conditioning contractors in St. Mary’s County in 2023, down 3.7% from 2019. That is one for every 816 households, against one for every 1,162 across the U.S. Since fiscal 2022, 2 SBA-backed loans worth $1.6M have gone to businesses classed as plumbing, heating and air-conditioning contractors in St. Mary’s County.
Population estimates show St. Mary’s County grew 2.4% from 2020 to 2025, slower than the U.S. (+3.1%). The Groundwork market score for HVAC and plumbing companies in St. Mary’s County is 44 (lower middle), #1,079 of 1,707 scored counties and #17 of 23 scored counties in Maryland.
How St. Mary’s County compares
The same measures for Maryland 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’s County | Maryland | U.S. |
|---|---|---|---|
| Listings per 10k households | 10.8 | 6.3 | 6.3 |
| Spending per listing | $3.4M | $5.5M | $4.8M |
| Households per official establishment | 816 | 1,190 | 1,162 |
| Official establishment growth, 2019–2023 | −3.7% | −4.8% | +7.6% |
| Population growth, 2020–2025 | +2.4% | +1.4% | +3.1% |
| Spending per household on home repairs, maintenance and insurance | $3,639 | $3,443 | $3,018 |
| Median household income | $119,446 | $103,678 | $80,734 |
| Groundwork market score | 44 | 65 |
Official counts and lending
Businesses
- Official establishments, 2019 to 2023
- 54 → 52−3.7% over the period
- Employees, 2023
- 494
- Annual payroll, 2023
- $34.1M
- One-person businesses, 2023
- Not publishedNot published for this business type
- Map listings, September 2026
- 461 chain location
- Listings at the U.S. rate for this spending
- 33The U.S. ratio of listings to household spending, applied here
SBA-backed loans since fiscal 2022
- Loans
- 2
- Amount
- $1.6M
SBA-backed loans to businesses classed as plumbing, heating and air-conditioning contractors in St. Mary’s 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. Mary’s County
- Population, 2025 estimate
- 116,692+2.4% since 2020
- Households
- 42,436
- Median age
- 38.0
- Homes lived in by their owners
- 73%
- Vehicles per household
- 2.1
- Land area
- 359 sq. mi.
- People per square mile
- 321
- Median household income
- $119,446+33.0% vs. 2015–2019, before inflation
- Average household income
- $142,976
- Median home value
- $407,600
- Jobs located here
- 35,732
- Daytime population
- 104,060Residents who don’t work, plus everyone whose job is here
Looking at a specific site in St. Mary’s 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 St. Mary’s 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 Maryland
Every Maryland market ranked →The highest-scoring counties in Maryland for HVAC and plumbing companies, numbered among those based in Maryland, with St. Mary’s County marked.
Top counties in Maryland
| Market | Score | Listings | Per 10k households | Spending per listing | Population growth | U.S. rank |
|---|---|---|---|---|---|---|
| 1Montgomery County, MD | 81 | 208 | 5.3 | $7.4M | +1.3% | #51 of 1,707 |
| 2Prince George’s County, MD | 76 | 168 | 4.8 | $6.9M | +0.5% | #97 of 1,707 |
| 3Howard County, MD | 73 | 68 | 5.6 | $7.4M | +1.9% | #143 of 1,707 |
| 4Cecil County, MD | 72 | 23 | 5.7 | $5.5M | +3.2% | #170 of 1,707 |
| 5Baltimore city, MD | 70 | 80 | 3.1 | $8.6M | −2.3% | #199 of 1,707 |
| 6Charles County, MD | 66 | 44 | 7.2 | $5.1M | +5.9% | #307 of 1,707 |
| 7Baltimore County, MD | 63 | 199 | 6.0 | $5.4M | −0.7% | #393 of 1,707 |
| 8Frederick County, MD | 63 | 89 | 8.5 | $4.4M | +11.0% | #403 of 1,707 |
| 9Washington County, MD | 62 | 36 | 6.0 | $4.8M | +2.0% | #433 of 1,707 |
| 10Anne Arundel County, MD | 60 | 166 | 7.4 | $5.1M | +1.7% | #495 of 1,707 |
| 17St. Mary’s County, MD | 44 | 46 | 10.8 | $3.4M | +2.4% | #1,079 of 1,707 |
Other business types in St. Mary’s 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 St. Mary’s County, MD?
Map listings as of September 2026 show 46 HVAC and plumbing companies in St. Mary’s County. One of them (2%) is a chain location. The listings count heating and air-conditioning companies and plumbers. Official counts show 52 businesses with payroll classed as plumbing, heating and air-conditioning contractors in 2023, down 3.7% from 2019.
How much do households in St. Mary’s County, MD spend on home repairs, maintenance and insurance?
About $154.4M a year, or $3,639 per household. That is 21% above the U.S. average (an index of 121, where 100 is the U.S. average). Spread across the 46 HVAC and plumbing companies on map listings, it comes to $3.4M 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 42,436 households in St. Mary’s County and national spending patterns by income.
How does St. Mary’s County, MD compare with the U.S. for HVAC and plumbing companies?
St. Mary’s County has 10.8 HVAC and plumbing companies per 10,000 households, 71% above the U.S. rate of 6.3. Spending per company is $3.4M, 29% below the U.S. figure of $4.8M. At the U.S. ratio of HVAC and plumbing companies to household spending, St. Mary’s County would have about 33, against 46 on map listings. There is one business with payroll in the industry for every 816 households, against one for every 1,162 across the U.S. The official count fell 3.7% from 2019 to 2023, against +7.6% for the U.S.
How fast is St. Mary’s County, MD growing?
Population estimates put St. Mary’s County at 116,692 people in 2025, up 2.4% since 2020, slower than the U.S. (+3.1%). It has 42,436 households. Median household income in St. Mary’s County is $119,446, 48% above the U.S. median of $80,734. Against the 2015–2019 survey, the median rose 33.0%, 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’s County scores 44 for HVAC and plumbing companies (lower middle), #1,079 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’s 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 St. Mary’s County
Screening a site or an acquisition in St. Mary’s 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. Mary’s 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.