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I have two polygon feature classes, census blocks and voting precincts. What I want to get is the count of census blocks that contain more than one voting precinct, that is, where precinct boundaries split a block.

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    There's a number of ways to address this, some manual and some scripted. Unioning the two FCs, then doing summary statistics on block count by precinct is probably easiest. – Vince Jun 29 '16 at 17:34
  • If your problem is more general, with, for example historic overlapping precincts you could use REGIONPOLYCOUNT, but only if you have access to workstation ARC/INFO. For some strange reason Esri didn't port that to later versions (?) – Kirk Kuykendall Jun 29 '16 at 17:48
  • @Vince, I'm not familiar with summary statistics. What exactly are the parameters in the tool I'm looking for? Or do you mean Summarize in the attribute table? – recurvata Jun 29 '16 at 19:27
  • If you're not familiar with a Desktop capability, you can pull up the documentation and use the Search box with the term. A search on "summary statistics" returned this – Vince Jun 30 '16 at 2:51
  • After some trial and error on the fields, got the count using @Vince recommendation. If you want to post as an answer, I'll mark it as correct. – recurvata Jun 30 '16 at 13:58
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As commented by @Vince:

There's a number of ways to address this, some manual and some scripted. Unioning the two FCs, then doing summary statistics on block count by precinct is probably easiest.

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