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So I made the "zoomed-in" map that I requested, using open source online software. It's stored here. References for Sixmile Island being in O'Hara Township include this USGS link.
Click this link, and after the map loads, click the box for the "Minor Civil Division labels" overlay, zoom in on Sixmile Island, wait for the data to finish "Loading", position the cursor on the island and double-click. It should display the word "O'Hara" on the island. (Or, just an extreme zoom-in without clicking should reveal it also.)
Also, one may view the Allegheny County GIS map and again do an extreme zoom-in, the map changes to an aerial photograph of the island. Click on the island to bring up a text box that states,"Municipality: O'HARA Owner:TOWNSHIP OF O'HARA". Jeff in CA (talk) 06:29, 7 March 2016 (UTC)[reply]