San Marino:
about 0.3 times the size of Washington, DC
Sao Tome and Principe:
more than five times the size of Washington,
DC
Saudi Arabia:
slightly more than one-fifth the size of the US
Senegal:
slightly smaller than South Dakota
Seychelles:
2.5 times the size of Washington, DC
Sierra Leone:
slightly smaller than South Carolina
Singapore:
slightly more than 3.5 times the size of Washington, DC
Slovakia:
about twice the size of New Hampshire
Slovenia:
slightly smaller than New Jersey
Solomon Islands:
slightly smaller than Maryland