Gaithersburg - Washington Grove Volunteer Fire Department - History, museum information, fire safety, Real Audio dispatch, photos and links. The Janus Museum - Has information about Allan Janus, the cottage, portfolio and photographs. Wikipedia: Washington Grove, Maryland - Free encyclopedia with history, geography and demographics. Town of Washington Grove - Official town web site, including historical and current photos, contact information for government officials, links to local and regional web sites, and the history of the town dating back to its founding as a church retreat location. Washington Grove - Information about the municipality from the Maryland State archives. Find the charter, ordinances and list of Mayors. WeatherBug: Washington Grove, MD - Forecast and live, local weather conditions from the Washington Grove Elementary School.