Abate v. Mundt

Background

Residents of Rockland County, New York, challenged a county plan that assigns 18 county legislators across the county’s five towns. For over 100 years county supervisors also served as town supervisors. After courts found severe malapportionment and several proposed plans failed in votes, the county adopted a plan based on 1969 population figures that assigns seats by dividing each town’s population by the smallest town (Stony Point, 12,114), rounding to whole representatives. The plan produces deviations: Orangetown −7.1%, Clarkstown +4.8%, with a total deviation of 11.9%.

Reasoning

The Court addressed whether those population differences violate the Constitution’s requirement that representation be substantially equal. The majority said population equality is required but small departures can be justified by legitimate local needs. It relied on Rockland County’s long tradition of overlapping town and county functions and on the absence of a built-in bias favoring particular groups. Because the plan substantially reduces malapportionment, preserves town-county ties, and contains no evident bias, the Court affirmed the state court’s approval and upheld the plan. Justice Brennan dissented, arguing the county did not make a good-faith effort to achieve equality and that an 11.9% deviation was unjustified.

Real world impact

The ruling lets Rockland County keep its town-based seat allocation and the existing method of assigning representatives. Voters and officials in the five towns will remain represented under the current seat counts. The Court cautioned that larger future deviations could still be unconstitutional, so the result is not a blanket approval of any larger disparities.

Dissents or concurrances

Justice Brennan (joined by Justice Douglas) dissented, insisting prior cases require a stricter, good-faith effort to reach near-exact population equality and that the 11.9% variance is too large.