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This must be a common enough problem that other users have come across it. I've finagled my way around inconsistencies and dropped observations, but now I'm reaching out to see if anyone knows of a 'holy grail' type spatial dataset.

I am in search of USA congressional district to county relationship files going back to the 1980s. While many components of said files are available online via the US Census Bureau (https://www.census.gov/geo/maps-data/data/cd_national.html), they do not release them for every year.

I've tried combining different online sources (combining this CD dataset (http://cdmaps.polisci.ucla.edu/) with the atlas of historical county boundaries (https://publications.newberry.org/ahcbp/)) in a GIS environment; however, inconsistencies in the shapefiles (see here:

enter image description here

lead to too many (or too few) relationships.

Does anyone have such a file on hand or know where I could obtain it?

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    If this is open data then I think the place to ask will be the Open Data Stack Exchange. – PolyGeo Dec 18 '18 at 22:24
  • I followed your suggestion and cross-posed there (with acknowledgement of cross-posting). Is it okay to keep this question here as this exchange has more traffic? No problem if not. – Reputable Misnomer Dec 19 '18 at 0:49
  • I see your question at opendata.stackexchange.com/questions/13643/… (and have suggested in an edit there that the acknowledgement of cross-posting be removed from the title and body). Since Open Data is still in Beta I think it is OK to leave a copy of your question here for now. – PolyGeo Dec 19 '18 at 0:54
  • Thanks - approved your edits! Appreciate your guidance on this questions and my previous ones :) As of now I think I may be closing in on a solution - if so I will write up a formal blog post about it and link it. – Reputable Misnomer Dec 19 '18 at 1:12

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