Zion Township does indeed appear on the census map:
http://factfinder.census.gov/servlet/MapItDrawServlet?geo_id=06000US1709784233&tree_id=4001&context=dt&_lang=en&_ts=229634201968
It is listed on the official Lake County website, which also states that there are 18 townships, not 17:
http://www.co.lake.il.us/government/township.asp
It appears on city-data.com:
http://www.city-data.com/township/Zion-Lake-IL.html
It has its own website:
http://www.ziontownship.org/
Based on all of this, it seems clear that the township does indeed exist. Omnedon (talk) 00:35, 24 May 2008 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2008-05-24T00:35:00.000Z","author":"Omnedon","type":"comment","level":1,"id":"c-Omnedon-2008-05-24T00:35:00.000Z-Zion_Township","replies":["c-Bkonrad-2008-05-25T14:53:00.000Z-Omnedon-2008-05-24T00:35:00.000Z"]}}-->
I tried adding a former communities and ghost towns section to this template with Half Day, Illinois included but was reverted. Half Day was a small, independent town for about 100 years, but was annexed by a large neighboring town in the 1990s and is now a neighborhood of that town. I believe that ghost towns and other former settled places should be included in these county templates. The article about Half Day covers some of its history as a town and this is why I think it qualifies to be included in a new section of the template for ghost towns and other formerly independent settlements. Burpelson AFB (talk) 02:24, 28 July 2010 (UTC)[reply]__DTELLIPSISBUTTON__{"threadItem":{"timestamp":"2010-07-28T02:24:00.000Z","author":"Burpelson AFB","type":"comment","level":1,"id":"c-Burpelson_AFB-2010-07-28T02:24:00.000Z-Ghost_towns_and_other_former_communities_RfC","replies":["c-Omnedon-2010-07-28T03:04:00.000Z-Burpelson_AFB-2010-07-28T02:24:00.000Z","c-Omnedon-2010-07-29T02:43:00.000Z-Burpelson_AFB-2010-07-28T02:24:00.000Z"]}}-->
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