| Business | Phone |
| Stanley W Machen 4815 Prince Georges Ave # 1, Beltsville 20705 | (301) 864-5115 |
| Real Estate Surveyors 4412 Powder Mill Rd # 214, Beltsville 20705 | (301) 931-9200 |
| Capital Development Design Inc 5010 Sunnyside Ave # 200, Beltsville 20705 | (301) 982-1781 |
| Capitol Surveys 10762 Rhode Island Ave, Beltsville 20705 | (301) 931-1350 |