" Arlington itself is an urban county of about 26 square miles. It has an interesting and unique history. Home to American Indian communities for more than 10,000 years, it was explored by English settlers in the early 1600s. Characterized as a highly-developed, densely-populated urban area, Arlington is still a county, with no incorporated cities or towns within its boundaries."
For more information, check Hirst's description or Information from Yahoo or contact IMS and ENAR local arrangement chairs.