The locations added to the clock are not stored in a simple file or folder that you can copy to other computers. The settings are stored in a binary database file similar to the registry on Windows. You instead will need to use the
dconf dump and
dconf load commands, to export and import the settings on the other computers, respectively.
On the computer with the existing settings, run:
dconf dump /org/gnome/clocks/ > gnome-clocks.dconf
Then copy the
gnome-clocks.dconf file to the other computers, and run this command on them:
cat gnome-clocks.dconf | dconf load /org/gnome/clocks/