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You didn't list names but there is a Samuel Bullock and family on the below census. Samuel, Mercy and Nola are listed for the family. It lists their address as,I believe as best as I can read it, 56 Short Street.
I hope this is your family and that it helps.
The census is on familysearch.org. You need to set up an acount but it is free. I have used it for years.
Dear Mr. Bingham,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located Population Schedules for the 1900 Census in the Records of the Bureau of the Census (Record Group 29). Some digital images of the 1900 census records are available on the Catalog for Indiana but not yet digitized for Dunkirk.
Therefore, we suggest that you search Ancestry for the 1900 Census and for possible Dunkirk city directories about your grandparents. There may be a fee for using Ancestry. Instead, you may view these records online at one NARA's facilities for free via a NARA PC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Some of the images from Ancestry sometimes are available on Family Search for free.
Indiana Historical Society for city directories that those institutions may have in their holdings.
We hope this is helpful. Best of luck with your family research!