The mailing list of the Department of the Geographer includes individuals from more than a dozen states, mostly east of the Mississippi River. For this reason, the Department of the Geographer does not maintain a physical "headquarters" per se.

Most unit business is conducted at events or via mail, phone or email.

To facilitate communication and participation in events, the unit has formed three regional “Survey Parties.” These parties are generally commanded by an officer with the rank of captain, and cover the following geographic areas:

• Thomas Hutchins’ Party- Maryland, Delaware, Virginia, eastern West Virginia, North Carolina, South Carolina, Georgia.
• Simeon DeWitt’s Party- Eastern Pennsylvania, New York, New Jersey, Connecticut, Rhode Island, Massachusetts, New Hampshire, Vermont.
• William Scull’s Party- Western Pennsylvania, western West Virginia, Ohio, Kentucky, Indiana, Illinois, Michigan.

While these regional parties generally represent the states of residence of our members, it is more important to think of them as the areas in which the Department attends events. For example, if you live in Delaware, but would prefer to attend more events in PA, NJ, and NY, then it would be appropriate to associate yourself with DeWitt’s Party, rather than Hutchins’ Party. That said, any member of the Department may attend any other party’s event.