We asked a member of the Edmunds Data Team, and here is the reply:
"Top three contenders for the title of 'Shortest Van' go to the following vehicles:
2001-2004 Chevrolet Venture @ 186.9 inches long
2010-present Ford Transit Connect @ 180.6 inches long
2006-present Mazda MAZDA5 @ 181.5 inches long
Please note the Venture was availabe in two lengths for the years shown; the shorter of the two is listed."
Thank you for using Edmunds!