Nevada StatutesLyon County243.230 - Creation—1861.243.235 - Boundaries redefined 1864, 1965, 1967 and 1969.243.240 - Portion of Esmeralda County detached and attached to Lyon County—1883.243.245 - Boundaries confirmed—1899.243.250 - Portion of Mineral County detached and attached to Lyon County—1933.