Re: 1880 CENSUS
The 1880 Census can be searched by surname (soundexed) for no charge at the LDS website:www.familysearch.org
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Click on search for ancestors, click on census on the left-hand side of the page.
417 State Street would be located in the Downtown Chicago area.It was Downtown even in 1875.Here is a website with a map of the wards in 1875.State Street was in the 20th Ward.
You can go to www.mapquest.com and enter 417 State Street and Chicago, IL into the search box and pull up a map of the area, which will narrow down the cross streets.