Glass, cement and stone manufacturers in Maryland
Maryland has 168 glass, cement and stone establishments employing 4,801 people (Census, 2023), and EPA's ECHO database lists 221 active glass, cement and stone facilities in the state. By employment it is Maryland's number 8 manufacturing industry, and Maryland ranks number 27 among states for it.
- NAICS subsector
- 327
- Nonmetallic Mineral Product Manufacturing
- Establishments
- 168
- Census 2023
- Employees
- 4,801
- Census 2023
- In EPA records
- 221
- With a page here
- 2
- Revised
- November 11, 2026
Glass, cement and stone factories with a page
| Facility | What it makes (NAICS) | City |
|---|---|---|
| Amrize Hagerstown Cement Plant (Formerly Holcim Ha | Cement Manufacturing | Hagerstown |
| New Ngc, Inc. DBA National Gypsum Company | Gypsum Product Manufacturing | Highlandtown |
These are the Maryland glass, cement and stone facilities that report to EPA's Toxics Release Inventory. The other 219 in EPA records don't have a page yet.
What these factories make
- Cement Manufacturing (NAICS 327310): 1 facility
- Gypsum Product Manufacturing (NAICS 327420): 1 facility
Where they cluster
Cities with the most active glass, cement and stone facilities in EPA records: Baltimore (31), Hagerstown (12), Frederick (9), Oakland (7), Rockville (7).
Glass, cement and stone manufacturing across the US. Everything made in Maryland.