| Business | Phone |
| Fairfax City Finance Dept 10455 Armstrong St, Fairfax 22030 | (703) 385-7870 |
| Fairfax City Treasurer 10455 Armstrong St, Fairfax 22030 | (703) 385-7902 |
| Fairfax Real Estate Tax Colls 10455 Armstrong St, Fairfax 22030 | (703) 385-7904 |
| Fairfax Revenue Commissioner 10455 Armstrong St, Fairfax 22030 | (703) 385-7884 |
| Fairfax Treasurer 10455 Armstrong St, Fairfax 22030 | (703) 385-7900 |