---
title: "Construction Companies in Maryland: 3,070 Listed (2026)"
description: "Ken's database lists 3,070 construction companies headquartered in Maryland (Oct 17, 2026). See the size breakdown, the largest firms and the filter."
path: /data/construction-companies-in-maryland
family: data
updated: 2026-10-17
data_as_of: 2026-10-17
html: /data/construction-companies-in-maryland
sources:
  - "https://app.ken.so"
  - "/pricing"
facts:
  company_count: "3,070"
  state: "Maryland"
  industry_filter: "\"Construction\""
  largest_size_band: "1-10 employees (59%)"
  data_as_of: "Oct 17, 2026"
  source: "Ken Search, POST /v1/search/companies"
---

# Construction Companies in Maryland

Ken's database lists 3,070 construction companies headquartered in Maryland as of Oct 17, 2026. The largest group, 59%, has 1-10 employees.

## Ken Search Results

### Ken Search

Query: Industry: "Construction", excluding "Real Estate", "Utilities" and "Architecture and Planning"; HQ state: Maryland; HQ country: United States; Employees on record: 1 or more

| Field | Value |
| --- | --- |
| Companies | 3,070 |
| 1-10 employees | 1,816 (59%) |
| 11-50 employees | 1,013 (33%) |
| 51-200 employees | 86 (3%) |

Ken's database, Oct 17, 2026. Headquarters counts, refreshed weekly.

Action: [Search these companies free in Ken](/waitlist) (cost: Free to search, 1 credit ($0.02) per valid email)

## How Many Construction Companies Are in Maryland?

**In short:** 3,070 construction companies in Ken's database have their headquarters in Maryland (Oct 17, 2026).

Ken's database lists 3,070 construction companies with headquarters in Maryland. The largest group, 59%, has 1-10 employees. A company with only a branch office in Maryland is not counted.

**Construction Companies in Maryland by employee range, Oct 17, 2026**

| Employees | Companies | Share |
| --- | --- | --- |
| 1-10 | 1,816 | 59% |
| 11-50 | 1,013 | 33% |
| 51-200 | 86 | 3% |
| 201-500 | 15 | <1% |
| 501-1,000 | 3 | <1% |
| 1,001-5,000 | 2 | <1% |
| Not listed | 135 | 4% |
| Total | 3,070 | 100% |

Employee range as listed on each company profile, for the companies in the count. Not listed means the profile shows no size.

## Largest Construction Companies in Maryland

**In short:** By employee count in Ken's database, the largest is The Whiting-Turner Contracting Company in Towson with 5,001-10,000 employees.

**Largest construction companies headquartered in Maryland by employee count, Oct 17, 2026**

| Company | City | Employees |
| --- | --- | --- |
| The Whiting-Turner Contracting Company | Towson | 5,001-10,000 |
| RK&K | Baltimore | 1,001-5,000 |
| DRB Group | Rockville | 1,001-5,000 |
| Ruppert Landscape | Laytonsville | 501-1,000 |
| Window Nation | Fulton | 501-1,000 |
| STRUCTURAL | Columbia | 501-1,000 |
| DRB Homes | Rockville | 501-1,000 |
| TAI | Owings Mills | 501-1,000 |
| Whitman, Requardt and Associates, LLP | Baltimore | 501-1,000 |
| Tate | Columbia | 501-1,000 |

Company-level data from Ken's database, ranked by employee count. This table reads each company's state from its address, so it can include large companies the count above misses because their record stores the state with a ZIP code. Public bodies, schools, job boards and companies with 50 employees or fewer are left out.

## How We Counted

**In short:** We counted construction companies in Ken's database with headquarters in Maryland on Oct 17, 2026.

- Filter: Companies in Construction and its sub-industries (contractors, civil engineering), excluding real estate, utilities and architecture firms, with headquarters in Maryland, United States, and at least one employee on record.
- Headquarters only. Companies with just an office in Maryland are not counted.
- These are companies in Ken's database (250M people and 24M companies), not every company that exists.
- Some records store the state with a ZIP code, and the state filter misses those, so read the count as a floor. The largest-companies table reads the state from each record's address, so it includes them.
- Counts as of Oct 17, 2026. We check them weekly, and the dates move only when a count or a listed company changes.
- Pages publish only at 50 companies or more. Ken is our product, and these counts come from its company database.

The request body for POST /v1/search/companies

```json
{"industries":["Construction"],"excludeIndustries":["Real Estate","Utilities","Architecture and Planning"],"countries":["US"],"states":["Maryland"],"employeesCount":{"min":1},"pageSize":0}
```

## FAQ

### How many construction companies are in Maryland?

Ken's database lists 3,070 construction companies headquartered in Maryland as of Oct 17, 2026.

### Which construction companies in Maryland have the most employees?

In Ken's database, The Whiting-Turner Contracting Company, RK&K and DRB Group have the most employees of the construction companies headquartered in Maryland.

### Can I get a list of construction companies in Maryland?

Yes. Run the filter on this page in Ken Search. Searching is free, and a valid email costs 1 credit ($0.02).

### How often is this count updated?

We check it weekly. The dates on this page move only when a count or a listed company changes, so an older date means nothing moved since.

### Why does this count differ from other sources?

Sources count differently: headquarters or any office, industry labels or government codes, and how many companies they track. This page counts headquarters in Ken's database with the filter shown above.

## Do this in Ken

### Search these companies in Ken

Open Ken Search with the same filter to see all 3,070 companies, narrow them by size or city, and find a valid email for the people you want to reach.

1. Set these filters: Industry: "Construction", excluding "Real Estate", "Utilities" and "Architecture and Planning"; HQ state: Maryland; HQ country: United States; Employees on record: 1 or more.
2. Narrow by employee range or city.
3. Find valid emails and add the companies to a campaign.

- Link: [Search these companies in Ken](/waitlist)
- API: `POST /v1/search/companies`
- MCP tool: `search_search_companies`
- Cost: Free to search, 1 credit ($0.02) per valid email

## Related

- [B2B company counts by industry and state](/data)
- [Find Construction Decision-Makers](/use-cases/construction)
- [Construction Companies in New York](/data/construction-companies-in-new-york)
- [Construction Companies in Vermont](/data/construction-companies-in-vermont)
- [Construction Companies in California](/data/construction-companies-in-california)
- [Construction Companies in Florida](/data/construction-companies-in-florida)
- [Construction Companies in New Jersey](/data/construction-companies-in-new-jersey)
- [Trucking Companies in Maryland](/data/trucking-companies-in-maryland)

## Sources

| Source | URL | Checked |
| --- | --- | --- |
| Ken's company database, queried through Ken Search (POST /v1/search/companies) | https://app.ken.so | 2026-10-17 |
| Ken pricing (credit cost per valid email) | /pricing | 2026-10-17 |

## Changelog

- 2026-10-17: Page published with counts from Ken's database.