When adding locations to Connect, you can add Contact information for that particular location.
Under Location Type>Contact, select the dropdown that contains all contacts listed in your community, then choose the contact you want to associate with the location:
If you do not see the contact listed, you can add them by selecting "Create a new contact" at the bottom of the drop down menu, then completing the information in the popup window:
As a Community Owner, you can select the custom attribute "Contact" as a part of your community information. Go to Admin>Location types and either select an existing location, or add a new one. There, you can select the Contact attribute and add it to the location information.
For more detailed information on Location Types, see the article Location Types