This is the first report of association and affinity indices between populations of mosquito larvae in north of Iran.
Predominant species were Cx. pipiens and An. maculipennis s.l. which show the highest co-occurrence.
This is the first record of Cx. torrentium and Cs. morsitans in Mazandaran Province. It should be noted that this is the second report of occurrence of Cs. morsitans in Iran.
The pair of species An. hyrcanus/An. pseudopictus showed significant affinity and association.