| Business | Phone |
| Charles County Adm 200 Baltimore St, La Plata 20646 | (301) 645-0550 |
| Charles County Animal Control 10425 Audie Ln, La Plata 20646 | (301) 609-3425 |
| Charles County Build & Trades 1001 Radio Station Rd, La Plata 20646 | (301) 932-3490 |
| Charles County Co-Op Extension 9375 Chesapeake St # 119, La Plata 20646 | (301) 753-8195 |
| Charles County Community Svc 101 Catalpa Dr # 100, La Plata 20646 | (301) 934-9305 |
| Charles County Election 9320 Wnw Industrial Rd, La Plata 20646 | (301) 934-8962 |
| Charles County Fire Board 6855 Crain Hwy, La Plata 20646 | (301) 934-2211 |
| Charles County Fiscal Svc 200 Baltimore St, La Plata 20646 | (301) 645-0570 |
| Charles County Human Resources 200 Baltimore St, La Plata 20646 | (301) 645-0585 |
| Charles County Planning Dept 200 Baltimore St, La Plata 20646 | (301) 645-0627 |
| Charles County Public Facility 1001 Radio Station Rd, La Plata 20646 | (301) 932-3440 |
| Charles County Register-Wills 200 Charles St, La Plata 20646 | (301) 932-3345 |
| Charles County Roads Dept 1001 Radio Station Rd, La Plata 20646 | (301) 932-3450 |
| Charles County Treasurer's Ofc 200 Baltimore St, La Plata 20646 | (301) 645-0685 |
| Honorable Richard A Cooper 200 Charles St, La Plata 20646 | (301) 932-3275 |