OP: all the populated systems in Colonia are safe, although the Jaques system has the lowest Security rating I think. So you can sell at any of them, although neither Colonia Dream nor Colonia Hub have Universal Cartographics.
The Colonia Citizens Network (who I'm with) would like more data to be sold at other stations rather than Jaques, because the Jaques faction has 98% Influence in that system which keeps the Colonia Council faction in constant undesirable states. Our SEPP members think that if we can get them to Boom for two weeks, we might be able to upgrade Colonia Hub's facilities.
I ought to just respond to DynamicBob's criticisms of the CCN above, as he keeps making them on threads all over the place and they should probably be addressed.
CCN is a Discord server that seeks to create a Colonial identity and provide the infrastructure for groups and independent pilots to collaborate and colonise the Nebula peacefully. It is made up of many player groups as well as many independent pilots.
It's not a player group itself, it's a completely open community. We seek to build ties between as many player groups as possible so that, as Colonia is colonised, relations between them are peaceful and collaborative rather than mistrustful.
So, CCN really is not standing in the way of "keeping Colonia open for everyone".