Boundaries within a County

I’m on In the center is the Interactive Data Map. I enter “Dade County, GA” in the Find box, and it zooms in to our little triangle-shaped county on the map. Now, when I click on the county, it subdivides into regions, but I can’t tell what those boundaries are based on (rivers, streets, water lines, population, etc.). I see that city-data is using OSM, so I came to this page and your folks. Can anyone explain what those boundaries are based on and how do I make a map with those same boundaries here on OSM?

Thanks for your help!


I’m still working on this, but it seems to be census tract information that creates those particular boundaries. So, I’m trying to put a census tract layer, but transparent enough to best see the road numbers on the map layer below it. I don’t know how to do any of that.



You need to ask the city data people as they may not even be using OSM data for these sub-divisions.

Looking at Dade County, on OSM itself, I selected one of its boundary ways, and there appear to be no administrative boundaries running along that below the county level, so I would say that, in that particular area, OSM simply does not contain the features you are referring to.

If I spent more time, I could download the county into JOSM and search it for lower level administration boundaries, or use overpass API to do the same, but, at the moment, I’m fairly sure there are none.

To customise an OSM rendering, you have a choice of searching for a third party service that already meets your needs, searching for one that allows limited customisation, or installing one of the rendering tool chains and configuring it to produce the rendering you actually want. Details of this have been given on the forum several times in the last month.

Thanks for your info. I ended up going to which had those same boundaries (they are census tracts) in a really detailed pdf file that has them marked along with the roads. And then if I want it any better, I can download the KML file, and those can be imported to layer over Google Earth and Google Maps. So, I’m good. Have a good one!