New Orleans was, before Katrina, the only parish (county) in Louisiana to have multiple assessors. There were seven. Each of them had his or her own district, and collectively they formed the Board of Assessors. The strange structure was the vestige of times past, with no rhyme or reason in modern times.
Howard, Janet and Rafferty, Shaun
"The Strange Case of the Seven Assessors,"
New England Journal of Public Policy: Vol. 32
, Article 8.
Available at: https://scholarworks.umb.edu/nejpp/vol32/iss1/8