DC Voter Registration Data
Saturday December 20, 2014
This is an expanded account; see dc_voter_reg on GitHub for the data and concise documentation.
DC voter registration data is public, but not very easy to get.
On Thursday, December 18, 2014, I took a printed copy of a PDF form that I found on the DC Board of Elections web site to 441 4th Street NW, suite 250 north, Washington, DC, 20001. I had to show ID, have my bag x-rayed, and go through a metal detector to get into the building.
I brought my checkbook so I could pay $2 for a CD-ROM of voter registration data. The clerk informed me that the data is updated daily. She burned my CD while I waited. She told me there are no rules on how the data can be used. I take it to be public domain.
On the CD were two files:
- The data was in a Microsoft Access database file called
DC VH EXPORT.MDB(154 MB). I bought a PC laptop running Windows 8, purchased and installed Microsoft Access, opened the file and exported the data as text. It comes out as 130 megabytes of uncompressed text. I was able to get the column headers out and stick them on top of the file so that it can be read as nice CSV. Zipped (using the Windows built-in) the result is the 20 MB 20141218-dc_voters.csv.zip.
- The provided documentation file was a plain text
Read Me.txt. I renamed this to 20141218-dc_voters.txt. It seems slightly out of date with respect to the data in that the later columns corresponding to elections are not the same in the documentation and in the data. These column names are interpretable as MMYYYY-T, I believe, where MM is numeric month, YYYY is four-digit year, and T is a letter corresponding to election type. I think G is General and P is primary.
You can also get voter registration data on a per-ward basis in Microsoft Access or Excel formats. They will email it to you, but you have to fax in the form to make this request. I wonder if they would accommodate daily requests for every ward's data. It seems like it would be much less annoying to just put the data online automatically; it isn't even very heavy. If we dream big, maybe the data could live in dat? Any option that doesn't require making a physical visit to their office during their fairly narrow business hours would be an improvement. Any format that doesn't require purchasing proprietary software would be an improvement.
Another thing you can get is images (PDFs?) of signatures for nominating petitions and ballot measures. You pay just $2 per CD-ROM, but these are only available during ten-day "challenge periods." So keep your eyes peeled! I haven't seen what these things look like.
At least you can get nice maps like this (or for individual wards) for just $10 each: