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 | Atlantic Ocean Seaboard | Baja California | California | Churchill | Columbia and Northwestern United States | Fraser | Great Basin | Gulf Coast | Gulf of Mexico, North Atlantic Coast | Hudson Bay Coast | Mackenzie | Mexico, Northwest Coast | Mississippi - Missouri | North America, Colorado | Northwest Territories | Pacific and Arctic Coast | Río Grande - Bravo | Saskatchewan - Nelson | St John | St Lawrence | United States, North Atlantic Coast | 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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| 26.8% | 0.273% | 42.5% | 4.84% | 23.3% | 22.5% | 22.1% | 40.8% | 69.5% | 22.9% | 43.3% | 5.78% | 45.4% | 30.9% | 63.9% | 49.2% | 24.7% | 28.5% | 2.90% | 27.2% | 47.9% | 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 | ||||||||||