Mineral County Nevada Map shows the county’s location, the county seat, neighbouring counties, the state capital, and many more. Mineral County is located in west-central Nevada. Its total area is 3,813 sq mi (9,880 sq km), where 3,753 sq mi (9,720 sq km) land area and 60 sq mi (200 sq km) is water area. Hawthorne is the county seat and also the largest city.