The Church of Jesus Christ of Latter Day Saints (LDS) has many resources for Muskingum County available on microfilm which can be ordered from and viewed at any of their Family Research Centers. Click HERE to find a Family Research Center near you.
The Online Family History Library Catalog can be found at http://www.familysearch.org/Eng/Library/FHLC/frameset_fhlc.asp. The Catalog for Muskingum can be loaded in this window by choosing the "LDS Catalog for Muskingum County" option above.
Some of the LDS' Muskingum resources can be found in the International Genealogy Index (IGI) and the batch numbers for those resources can be found by choosing the "LDS IGI Batch Numbers for Muskiungum County" option above.
If you experience any problems accessing either option, just reload the page and try again as there seems to be a timing issue with the LDS server.