page_title: Johnson County, Tennessee
section_title: Geography
hierarchical_section_title: Johnson County, Tennessee / Geography
caption_attribution_description: English: Snake Mountain, viewed from the Trade community of Johnson County, Tennessee, United States. U.S. Route 421 is on the right.
context_page_description: Johnson County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 18,244. Its county seat is Mountain City. It is the state's northeasternmost county, sharing borders with Virginia and North Carolina.
context_section_description: According to the U.S. Census Bureau, the county has a total area of 303 square miles (780 km²), of which 298 square miles (770 km²) is land and 4.2 square miles (11 km²) (1.4%) is water.
  Situated entirely within the Blue Ridge Mountains, Johnson County is relatively rugged and hilly.  The county's boundary with Sullivan County to the northwest is defined as the ridgeline of Holston Mountain, while the Iron Mountains provide the county's boundary with Carter County to the southwest.  Snake Mountain, at 5,574 feet (1,699 m), is the county's highest point.
caption: Snake Mountain, viewed from Trade
exif: {"Image ImageDescription": "", "Image Make": "Canon", "Image Model": "Canon PowerShot SX710 HS", "Image Orientation": "Horizontal (normal)", "Image XResolution": "180", "Image YResolution": "180", "Image ResolutionUnit": "Pixels/Inch", "Image Software": "iPhoto 9.5.1", "Image DateTime": "2015:09:27 00:41:26", "Image ExifOffset": "248", "EXIF ExposureTime": "1/400", "EXIF FNumber": "9/2", "EXIF ISOSpeedRatings": "160", "EXIF ExifVersion": "0230", "EXIF DateTimeOriginal": "2015:09:27 00:41:26", "EXIF DateTimeDigitized": "2015:09:27 00:41:26", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "3", "EXIF ShutterSpeedValue": "277/32", "EXIF ApertureValue": "139/32", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "139/32", "EXIF MeteringMode": "Pattern", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "12193/1000", "EXIF SubSecTime": "44", "EXIF SubSecTimeOriginal": "44", "EXIF SubSecTimeDigitized": "44", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "4321", "EXIF ExifImageLength": "3064", "EXIF FocalPlaneXResolution": "232751/11", "EXIF FocalPlaneYResolution": "486000/23", "EXIF FocalPlaneResolutionUnit": "2", "EXIF SensingMethod": "One-chip color area", "EXIF FileSource": "Digital Camera", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF DigitalZoomRatio": "1", "EXIF SceneCaptureType": "Standard"}