The 1850 Marion County, West Virginia, US Federal Census 
contains 250 pages (census images).
http://www.usgwarchives.net/wv/marion/census/1850/

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Copyright.  All rights reserved.
http://www.usgwarchives.net/copyright.htm
http://www.usgwarchives.net/wv/wvfiles.htm
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If you are interested in helping to transcribe the index, contact the 
Marion County File Manager (email link is on the following webpage):
http://www.usgwarchives.net/wv/marion/marion.htm

In the folder for the census image files:
http://www.usgwarchives.net/wv/marion/census/1850/
the name of each census-image-file is the stamped page number for that sheet.

When the stamped page numbers were added, they were placed only on the front-side.
The reverse-side of the page was not stamped. An "a" has been added to the
number on the pages that were stamped. For the reverse-side of the page,
a "b" has been added to the same number that's stamped on the front-side.

The page number range for the Marion County WV 1850 Census: 113a-237b
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DISTRICT                              PAGE-NUMBER-RANGE
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Eastern District                          113a-158b
  Fairmont in the Eastern District       (139b-143b)
Western District                          159a-237b
  Palatine in the Western District       (181b-188b)

There is a SURNAME index located at:
http://files.usgwarchives.net/wv/marion/census/1850/1850indx.txt