Nev. Const. art. 4, § 36
The legislature shall not abolish any county unless the qualified voters of the county affected shall at a general or special election first approve such proposed abolishment by a majority of all the voters voting at such election. The legislature shall provide by law the method of initiating and conducting such election.
[Added in 1940. Proposed and passed by the 1937 legislature; agreed to and passed by the 1939 legislature; and approved and ratified by the people at the 1940 general election. See: Statutes of Nevada 1937, p. 564; Statutes of Nevada 1939, p. 360.]