Nevada's At-large congressional district

Nevada's at-large congressional district was created when Nevada was granted statehood in 1864, encompassing the entire state. It existed until 1983, when it was made obsolete by the 1980 Census and subsequent reapportionment in which Nevada was awarded a second seat in the House of Representatives. Nevada began electing two representatives from separate districts commencing with the election of 1982 and the 98th Congress.

...
Wikipedia