| Rank | Country | Sex ratio |
142 | Tuvalu |  at birth: 1.05 male(s)/female under 15 years: 1.04 male(s)/female 15-64 years: 0.96 male(s)/female 65 years and over: 0.59 male(s)/female total population: 0.96 male(s)/female (2008 est.) |
205 | Uganda |  at birth: 1.03 male(s)/female under 15 years: 1.01 male(s)/female 15-64 years: 1.01 male(s)/female 65 years and over: 0.72 male(s)/female total population: 1 male(s)/female (2008 est.) |
62 | Ukraine |  at birth: 1.06 male(s)/female under 15 years: 1.06 male(s)/female 15-64 years: 0.92 male(s)/female 65 years and over: 0.51 male(s)/female total population: 0.86 male(s)/female (2008 est.) |
143 | United Arab Emirates |  at birth: 1.05 male(s)/female under 15 years: 1.05 male(s)/female 15-64 years: 2.74 male(s)/female 65 years and over: 1.84 male(s)/female total population: 2.19 male(s)/female (2008 est.) |
144 | United Kingdom |  at birth: 1.05 male(s)/female under 15 years: 1.05 male(s)/female 15-64 years: 1.03 male(s)/female 65 years and over: 0.75 male(s)/female total population: 0.98 male(s)/female (2008 est.) |
145 | United States |  at birth: 1.05 male(s)/female under 15 years: 1.05 male(s)/female 15-64 years: 1 male(s)/female 65 years and over: 0.73 male(s)/female total population: 0.97 male(s)/female (2008 est.) |
| United States Pacific Island Wildlife Refuges | void |
160 | Uruguay |  at birth: 1.04 male(s)/female under 15 years: 1.03 male(s)/female 15-64 years: 0.99 male(s)/female 65 years and over: 0.67 male(s)/female total population: 0.95 male(s)/female (2008 est.) |
146 | Uzbekistan |  at birth: 1.05 male(s)/female under 15 years: 1.04 male(s)/female 15-64 years: 0.98 male(s)/female 65 years and over: 0.7 male(s)/female total population: 0.98 male(s)/female (2008 est.) |
147 | Vanuatu |  at birth: 1.05 male(s)/female under 15 years: 1.04 male(s)/female 15-64 years: 1.04 male(s)/female 65 years and over: 1.07 male(s)/female total population: 1.04 male(s)/female (2008 est.) |
148 | Venezuela |  at birth: 1.05 male(s)/female under 15 years: 1.03 male(s)/female 15-64 years: 0.97 male(s)/female 65 years and over: 0.8 male(s)/female total population: 0.98 male(s)/female (2008 est.) |
29 | Vietnam |  at birth: 1.07 male(s)/female under 15 years: 1.08 male(s)/female 15-64 years: 0.99 male(s)/female 65 years and over: 0.63 male(s)/female total population: 0.98 male(s)/female (2008 est.) |
63 | Virgin Islands |  at birth: 1.06 male(s)/female under 15 years: 1.02 male(s)/female 15-64 years: 0.9 male(s)/female 65 years and over: 0.8 male(s)/female total population: 0.91 male(s)/female (2008 est.) |
| Wake Island | void |
| Wallis and Futuna | void |
64 | West Bank |  at birth: 1.06 male(s)/female under 15 years: 1.05 male(s)/female 15-64 years: 1.05 male(s)/female 65 years and over: 0.74 male(s)/female total population: 1.04 male(s)/female (2008 est.) |
| Western Sahara | NA |
| World |  at birth: 1.07 male(s)/female under 15 years: 1.06 male(s)/female 15-64 years: 1.02 male(s)/female 65 years and over: 0.78 male(s)/female total population: 1.01 male(s)/female (2008 est.) |
149 | Yemen |  at birth: 1.05 male(s)/female under 15 years: 1.04 male(s)/female 15-64 years: 1.03 male(s)/female 65 years and over: 0.94 male(s)/female total population: 1.03 male(s)/female (2008 est.) |
206 | Zambia |  at birth: 1.03 male(s)/female under 15 years: 1.01 male(s)/female 15-64 years: 1 male(s)/female 65 years and over: 0.72 male(s)/female total population: 1 male(s)/female (2008 est.) |
207 | Zimbabwe |  at birth: 1.03 male(s)/female under 15 years: 1.02 male(s)/female 15-64 years: 1.01 male(s)/female 65 years and over: 0.83 male(s)/female total population: 1.01 male(s)/female (2008 est.) |