| Business | Phone |
| Allegany Construction Inc 3928 Rosewood Rd, Monrovia 21770 | (301) 865-5202 |
| David C Smith & Son Inc 3431 Kemptown Church Rd, Monrovia 21770 | (301) 253-1477 |
| Mt Airy Building Co 4937 Green Valley Rd, Monrovia 21770 | (301) 831-3606 |
| John R Salmons Sr 3516 Marigold Dr, Monrovia 21770 | (301) 831-6194 |
| Ssd Contractors 3013 White Pine Dr, Monrovia 21770 | (301) 865-9899 |
| Tapscott Contractors 3923 Bartholows Rd, Monrovia 21770 | (301) 414-5400 |