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Comment by mattlondon | Hacker News Reader

I couldn't get it to work for the three towns I tried near me ("no relation found with that ID").

I am assuming it is US only.

It seems to be somewhat particular about relation IDs. I have it working for Palo Alto, with relation ID 1544955. If you want to try this for your city, I recommend zooming in the city on openstreetmap.org, clicking the "Query features" button on the right side of the map (it's the cursor with a question mark icon), and clicking within the boundaries of you city. On the left side, a list of features will appear. Scroll down to enclosing features, and click on the appropriate entry. A relation name and number will be displayed at the top, with the OSM data below.

I hope this stays within the Overpass API server's usage limits. Processing Palo Alto caused the page to download ~85 MB from overpass-api.de, which asks users to stay below 10k queries and 5 GB per day. The OSM wiki lists other servers, some of which allow heavier usage.[0]

[0]: https://wiki.openstreetmap.org/wiki/Overpass_API

That is a good way to find the boundary relation and one I had not thought of.

As for the Overpass API limits -- yes, if folks start to actually use this on any kind of scale, this will croak. I should perhaps do some logging, https://github.com/mvexel/meetyourmappers/issues/3

My city boundaries were not available, only a state level, which was too big for this tool.

Same. I couldn't figure out a working relation ID. This is too hard to use.

The note says "It must be small-ish (admin_level 6 or higher)", which caught me out at first.

I can't use Copenhagen, which is too large a city, but I can use "Copenhagen Municipality" (2192363). This can be found with the pointer-? icon at the bottom of the set on the right, and looking for enclosing areas with a high enough admin_level.

It works worldwide as long as the ID entered is an OSM boundary relation. Do you have an example you tried that failed?

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