1.) Filtering by polygon would be difficult at the moment, although we are actually talking about creating a separate point-in-polygon service (no promises as t

1.) Filtering by polygon would be difficult at the moment, although we are actually talking about creating a separate point-in-polygon service (no promises as to when yet :P), since we use it during the process of importing all our data, but the code isn't really generalized (it's at https://github.com/pelias/admin-lookup/ https://github.com/pelias/admin-lookup/ if you did want to take a look). However, adding filtering by state is pretty easy. It works the same way as our country lookup: at import time we do point-in-polygon lookup for countries, states, neighborhoods, etc for everything, and then record that as text fields with a consistent name in the actual documents we put in Elasticsearch. Then you can just query the text field and since the names of countries (we use ISO-3166-1 alpha2/3 codes) and states are pretty well defined, it works quite well. 2.) Not likely for full polygon data, although we are thinking about doing something with TIGER data which has street address ranges for the US. I'm not quite sure what you're trying to accomplish but you're welcome to drop by our gitter room (https://gitter.im/pelias/api https://gitter.im/pelias/api) and perhaps we can figure something out. 3.) It's probably poorly tagged data in OSM then, but again, we can chat about it on gitter more if you'd like. We re-import data once a week, so if you wanted to make changes to OSM, they should start showing up by Monday.