Plumbing and HVAC contractors / Maryland
How many plumbing, heating and air-conditioning contractors are in Maryland?
The Census Bureau counted 1,986 plumbing, heating and air-conditioning contractors with paid employees in Maryland in 2023. That is 4.3% fewer than in 2017.
MARYLAND · 2023
The count
1,986
plumbing, heating and air-conditioning contractors with paid employees
- Employees
- 29,326
- Average per site
- 14.8
- Change since 2017
- −4.3%
- State rank
- 18 of 51
What the number means
Maryland had 1,986 plumbing, heating and air-conditioning contractors in 2023, ranking number 18 among the 50 states and the District of Columbia. Together they employed 29,326 people and paid $2.3 billion in annual payroll, an average of 14.8 employees per site.
These businesses make up 1.39% of every employer establishment in Maryland, close to the 1.33% national share. A site count is not the same as the number of companies: a chain with 40 locations counts 40 times.
52% of plumbing, heating and air-conditioning contractors in Maryland have fewer than 5 employees, against 58% across the U.S.
Maryland holds 1.8% of the nation's plumbing, heating and air-conditioning contractors and 1.7% of all U.S. employer establishments, so, measured against the state's overall size, the trade is about as common as in the country as a whole. The most common size class is under 5 employees (1,029 sites). Average payroll per employee is $77,068, against $73,693 for the U.S. trade.
Size of the businesses
| Employees per site | Share | Sites | Share |
|---|---|---|---|
| Under 5 | 1,029 | 51.9% | |
| 5 to 9 | 363 | 18.3% | |
| 10 to 19 | 264 | 13.3% | |
| 20 to 49 | 197 | 9.9% | |
| 50 to 99 | 82 | 4.1% | |
| 100 to 249 | 41 | 2.1% | |
| 250 to 499 | 8 | 0.4% |
Count since 2017
Index: 2017 = 100. Employer establishments only. 2017 count 2,076; 2019 count 2,086; 2022 count 2,048; 2023 count 1,986. Employment +10.4% since 2017.
Biggest other trades in Maryland
| Trade | Sites | Employees | Since 2017 |
|---|---|---|---|
| Full-service restaurants | 3,803 | 90,952 | +6.9% |
| Landscaping services | 2,052 | 19,366 | +1.2% |
| General auto repair | 1,631 | 8,625 | −3.7% |
| Child day care | 1,505 | 20,056 | −2.2% |
| Beauty salons | 1,481 | 8,613 | −2.9% |
| Janitorial services | 1,436 | 31,862 | +0.2% |
| Coffee shops and snack bars | 1,078 | 13,724 | +17.8% |
| Fitness centers | 704 | 14,580 | −1.7% |
Plumbing and HVAC contractors in nearby ranks
| State | Sites | Rank |
|---|---|---|
| Arizona | 2,567 | 15 |
| Washington | 2,242 | 16 |
| Indiana | 2,008 | 17 |
| Wisconsin | 1,944 | 19 |
| Missouri | 1,915 | 20 |
| Tennessee | 1,899 | 21 |
All states for plumbing, heating and air-conditioning contractors · Every trade in Maryland
Questions
How many plumbing, heating and air-conditioning contractors are in Maryland?
The Census Bureau's County Business Patterns counted 1,986 plumbing, heating and air-conditioning contractors with paid employees in Maryland in 2023. That ranks Maryland number 18 among the 50 states and the District of Columbia.
Is the number of plumbing, heating and air-conditioning contractors in Maryland growing?
Between 2017 and 2023 the count shrank (4.3%), from 2,076 to 1,986. Across the United States the count changed by +8.5% over the same period. These years include the 2020 pandemic.
Does this count include self-employed owners with no staff?
No. County Business Patterns covers establishments with at least one paid employee. A sole proprietor with no employees is counted in a separate Census series called Nonemployer Statistics, which this site does not use yet, so the real number of people working in this trade is higher than the figure shown.
Read this before using the number
These counts describe how many businesses already exist. They say nothing about demand, profit, competition near you or how much any owner earns, and we make no estimate of income. Check local licensing, costs and rules before acting on any figure here. See the disclaimer.
Source: U.S. Census Bureau, County Business Patterns (2023; change measured against 2017, 2019 and 2022). Establishments with paid employees only; employment and payroll carry Census noise infusion. Retrieved November 2, 2026. Method and sources.