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Cache placements inside of cemeteries are not allowed in Illinois without permission. Caches may be placed outside of the perimeter. You are allowed to have a "virtual" stage inside of a cemetery (i.e. Find a certain marker, use the information to calculate the actual coordinates of the cache hidden somewhere nearby outside of the cemetery.

Illinois Department of Natural Resources

A permit is required to hide caches on IDNR-managed properties.

Contact Info: http://dnr.state.il.us/lands/landmgt/programs/dayuse/geocaching.htm

DuPage County Forest Preserves

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Contact Info: http://www.kaneforest.com/recreation/geocaching.aspx

McHenry County Forest Preserves

A permit is required to hide geocaches on MCFPD land.

Contact Info: http://www.mccdistrict.org/web/re-geocache.htm

Will County Forest Preserves

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Contact Info: http://www.reconnectwithnature.org/resources/recreational-activities/activity-detail/default.asp?id=24&name=Geocaching

Winnebago County Forest Preserves

A permit and fee are required to place caches in WCFPD land.

Contact Info: http://www.mccdistrictwcfpd.org/activities/webgeocaching/re-geocache.htm