Other Buddhist Organizations in Northern Virginia
I think the service is in English for all of the below and I think these are still active. You might want to call or email before attempting to attend an event at any of these.
Ekoji Burke, Jodo Shin Shu Tradition, Japanese, Affiliated with Buddhist Churches of America, service in English. I've been there, it's a good group.
Guhyasamaja, Centreville, Tibetan, Gelugpa school, affiliated with FPMT
Potomac Zen Sangha Alexandria City, Korean, Zen affiliated with World Zen, service in English, I've been there, it's a good group.
Wat Yarn, Sterling, Thai, Theravada
Longchenpa Institute Stafford, Tibetan, Nyingmapa school
Across the River in DC & Maryland
I rarely make it across the river on account of the awful traffic, but here are some links.
Dharma DC (has a fantastic directory of Buddhist groups and organizations in VA/DC/MD)
Directories
Buddha Net Virginia page
Community of Mindful Living Zen sitting groups
Unitarian Universalist Churches
Surprisingly, many Buddhists and people interested in Buddhism find meditation groups or Buddhist groups that meet at UU churches. Typically Buddhist related events are organized as a club or group within the UU church. Here is the complete NoVA UU list.
Here are the NoVA UU churches with Buddhist specific events.
Buddhist Fellowship at the UUCA in Arlinton
UU of Sterling- Meditation Group
Suggestion
There is a divide between the ethnic and immigrant Buddhists and the non-ethinic, non-immigrant Buddhists. If you are searching for a group, make a special effort to try out groups that don't match your ethnic background.