SVG map of all Helsinki sub-districts, should be used as a basis for any other maps.
Recommended color for coloring districts is "ff00008e" which is slightly transparent.
<a href="//commons.wikimedia.org/wiki/User:Ningyou" title="User:Ningyou">Ningyou</a>
CC BY 3.0
Self made, based on publicly available maps from <a rel="nofollow" class="external text" href="http://ptp.hel.fi/hanke/">Helsinki City Geographic Information system</a> (Choose "Kiinteistökartta").