Despite renewed interest in metropolitan governance, little attention
has been given to issues of representation by regional governing entit
ies. Many regional bodies operate under an arrangement whereby each lo
cal government receives an equal vote-systematically underrepresenting
large jurisdictions and unincorporated areas. The author describes an
index to measure the (dis)proportionality of representation on the go
verning boards of regional institutions. Applying the index to metropo
litan planning organizations in California, lie finds that most have a
substantially skewed representational structure. Such patterns nay vi
olate constitutional guarantees of equal protection, given the enhance
d policy-making role of metropolitan planning organizations under rece
nt federal transportation law.