 Also, a very small portion of Fort Eustis property adjacent to Skiffe's Creek Reservoir and the southeastern tip of the Greenmount Industrial Park is also located in the county, although almost all of Fort Eustis is now located in the independent city of Newport News (which consolidated with the former Warwick County in 1958 to form the present large city).From the establishment of Jamestown in 1607 through the middle of the 20th century, James City County's economy was based largely on an agriculture, with many farms and substantial tracts of undeveloped forests.After the decline of Jamestown in the 18th century, commerce was centered on Williamsburg, which was partially located within the county.