Arlington County, Virginia addition to receiving the lowest proportion of Arlington's vote for a Democratic or Republican candidate in the past century. Arlington is part of Virginia's 8th congressional district, represented by Democrat Don Beyer. The United States Postal Service designates zip codes starting with "222" for exclusive use in Arlington County. However, federal institutions, like Ronald Reagan Washington National Airport and The Pentagon use Washington zip codes. Arlington has consistently had the lowest unemployment rate of any jurisdiction in Virginia. The unemployment rate in Arlington was 4.2% in August 2009. 60% of office space in the Rosslyn-Ballston corridor is leased to government
Arlington County Fire Department and provide emergency and support services to Arlington County. Prior to 1950, independent volunteer fire companies protected Arlington County. As the demand for services for fire and EMS grew, the need for full-time paid staff was acknowledged by the County. Staff was hired, first to augment the volunteers, then finally to provide the full range of services required in a modern, urban, fire department. The volunteer members ride as supplemental staffing on apparatus and do not count as minimum staffing. The Arlington County Fire Department uses the volunteer apparatus for providing support services, such as special event stand-bys, storm and