According to Official Guinness Records,
The longest line of carved pumpkins consists of 3,975 pumpkins, achieved by the City of Richland Center (USA), in Richland Center, Wisconsin, USA, on 30 October 2016. The length of the line was measured by Scott Warner, PLS of Jewell Associates Engineers at 1,046.57 m (3,433.65 ft).
For a complete list of 2016 records, please visit 2016 Guinness Records in United States.