And it would get unwieldy if there were more than ~a page of regions (40 or so)... might have to switch to a hierarchical menu at that point. But unless someone already has a standard UI component they like for hierarchical menus, let's keep it simple.
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Micah Altman, Ph.D. <
http://redistricting.info> Twitter: @drmaltman
Senior Research Scientist, Institute for Quantitative Social Science, Harvard U.
Archival Director, Henry A. Murray Archive;
"Entia non sunt multiplicanda sine necessitate" - Dr. Invincibilis (Corollary, "Ad indicia spectate.")