The authors examine the political career paths followed by the 3,803 individuals who served in the House of Commons and/or Senate between 1867 and 1984 inclusive. Given Joseph Schlesinger's argument that career patterns significantly affect political integration in federal states, particular attention is paid to the provincial experience of national parliamentarians, and to variations in that experience over time and across regions. The data show that national recruitment from provincial legislatures has declined over time, and is particularly uncommon in Ontario and Quebec. Overall, the structure of political careers in Canada is bifurcated rather than integrated; politicians do not move through the ranks but rather face a choice between provincial or national careers.