A world map showing male-female ratios. Dark blue to light blue (1 to more than 1): Saudi Arabia, China, Sudan. Orange to red (0.83 to 0.95): Mongolia, Colombia, Ukraine, Russia, U S A, Brazil, and Australia. The region near the South Pole has no data.
Class | Rank | Ratio of males to females | Class | Rank | Percent | Class | Rank | Percent | Value | Adams | Akutan | Aniakchak | Atka | Bachelor | Baker | Belknap | Black Butte Crater Lava Field | Black Peak | Black Rock Desert | Blue Lake Crater | Buzzard Creek | Carrizozo | Chiginagak | Churchill | Cleveland | Crater Lake | Craters of the Moon | Dana | Davis Lake | Diamond Craters | Dotsero | Edgecumbe | Edziza | Fisher | Fourpeaked | Garibaldi | Glacier Peak | Golden Trout Creek | Great Sitkin | Griggs | Haleakala | Hayes | Hell's Half Acre | Hood | Hoodoo Mountain | Hualalai | Iliamna | Imuruk Lake | Indian Heaven | Iskut-Unuk River Cones | Jefferson | Jordan Craters | Kaguyak | Katmai | Kilauea | Kiska | Korovin | Kupreanof | Lassen Volcanic Center | Little Sitkin | Mageik | Makushin | Mammoth Mountain | Markagunt Plateau | Martin | Mauna Kea | Mauna Loa | Meager | Medicine Lake | Mono Lake Volcanic Field | Mono-Inyo Craters | Nazko | Newberry | Novarupta | Okmok | Pavlof | Rainier | Red Hill | Redoubt | Roundtop | Salton Buttes | San Francisco Volcanic Field | Sand Mountain Field | Seguam | Semisopochnoi | Shasta | Shishaldin | Snowy Mountain | Spurr | St. Helens | St. Paul Island | Takawangha | Tanaga | Three Sisters | Trident | Tseax River Cone | Ubehebe Craters | Ugashik-Peulik | Uinkaret Field | Ukinrek Maars | Veniaminof | Vsevidof | Wapi Lava Field | Wells Gray-Clearwater | West Crater | Westdahl | Wrangell | Yantarni | Yellowstone | Yunaska | Zuni-Bandera | |
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| 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | |||||||||||