Since it's beginning, the Society has seen a steady growth with members nationwide and overseas.   It is a not-for-profit corporation chartered in the state of Missouri and has been approved by the Internal Revenue Service as a Class 509(a)(1) organization.   Annual memberships are available as follows; $30.00 for a Regular membership and $40.00 for a Sustaining membership (a Sustaining membership is for those individuals who desire to make a monetary contribution in excess of regular dues).   Any amount contributed over the regular dues is tax deductible.   The MPHS does offer overseas memberships.   Due to changes in overseas postal rates please contact the MPHS Secretary for membership costs to your specific country.

Membership includes 4 issues (Spg, Sum, Fall, Win) of The Eagle, access to Member Only Web Pages and the following year's calendar.   It also entitles members to a discounted price on selected Missouri Pacific books, back issues of The Eagle and previous calendars, and other special projects that may be offered during the year.