15-64 years: 1.03 male(s)/female
65 years and over: 0.76 male(s)/female
total population: 0.99 male(s)/female (2008 est.)

Marshall Islands
at birth: 1.05 male(s)/female
under 15 years: 1.04 male(s)/female
15-64 years: 1.05 male(s)/female
65 years and over: 0.94 male(s)/female
total population: 1.04 male(s)/female (2008 est.)

Mauritania
at birth: 1.03 male(s)/female
under 15 years: 1 male(s)/female
15-64 years: 0.98 male(s)/female
65 years and over: 0.66 male(s)/female
total population: 0.98 male(s)/female (2008 est.)

Mauritius
at birth: 1.05 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: 0.97 male(s)/female (2008 est.)

Mayotte
at birth: 1.03 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 1.16 male(s)/female
65 years and over: 1.03 male(s)/female
total population: 1.09 male(s)/female (2008 est.)

Mexico
at birth: 1.05 male(s)/female
under 15 years: 1.04 male(s)/female
15-64 years: 0.94 male(s)/female
65 years and over: 0.82 male(s)/female
total population: 0.96 male(s)/female (2008 est.)

Micronesia, Federated States of
NA

Moldova
at birth: 1.06 male(s)/female
under 15 years: 1.06 male(s)/female
15-64 years: 0.94 male(s)/female
65 years and over: 0.59 male(s)/female
total population: 0.91 male(s)/female (2008 est.)

Monaco
at birth: 1.06 male(s)/female
under 15 years: 1.05 male(s)/female
15-64 years: 0.98 male(s)/female
65 years and over: 0.69 male(s)/female
total population: 0.91 male(s)/female (2008 est.)

Mongolia
at birth: 1.05 male(s)/female
under 15 years: 1.04 male(s)/female
15-64 years: 1 male(s)/female
65 years and over: 0.77 male(s)/female
total population: 1 male(s)/female (2008 est.)

Montserrat
at birth: 1.05 male(s)/female
under 15 years: 1.09 male(s)/female
15-64 years: 0.92 male(s)/female
65 years and over: 1.88 male(s)/female
total population: 1.01 male(s)/female (2008 est.)

Morocco
at birth: 1.05 male(s)/female
under 15 years: 1.04 male(s)/female
15-64 years: 1 male(s)/female
65 years and over: 0.75 male(s)/female
total population: 0.99 male(s)/female (2008 est.)

Mozambique
at birth: 1.02 male(s)/female
under 15 years: 1.01 male(s)/female
15-64 years: 0.95 male(s)/female
65 years and over: 0.71 male(s)/female
total population: 0