Duplicate addresses in Seattle
It was pointed out that Seattle has a number of duplicate addresses in OSM. Running a query in overpass convinced me that there were more than anticipated.
The overpass query run on overpass-turbo.eu
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<osm-script output="json" timeout="900" element-limit="1073741824">
<id-query {{nominatimArea:Seattle}} into="area"/>
<!-- gather results -->
<union>
<query type="node">
<has-kv k="addr:housenumber" />
<has-kv k="addr:city" v="Seattle" />
<!-- <has-kv k="source" v="King County GIS" /> -->
<area-query from="area"/>
</query>
</union>
<!-- print results -->
<print mode="body"/>
<recurse type="down"/>
<print mode="skeleton" order="quadtile"/>
</osm-script>
Some duplicates can easily be fixed by removing the duplicate. However, King County lables many buildings with the same address, such as mobile home parks. These need a add:unit tag added.
If you want to help, the list below has duplicates. Open up JOSM, then click on an item in the list.