<p><pre><code>  Rank  Country        Pop.Density
  ----  -------------  -----------------
    1.  South Korea    493/km^2 (21st)
    2.  Japan          337.4/km^2 (30th)
    3.  Hong Kong      6076.4/km^2 (4th)
    4.  Romania        90/km^2 (104th)
    5.  Sweden         20.6/km^2 (192nd)
    6.  Ireland        73.4/km^2 (??)
    7.  Netherlands    396/km^2 (24th)
    8.  Switzerland    188/km^2 (65th)
    9.  Denmark        127.9/km^2 (78th)
   10.  Czech Republic 132/km2 (77th)
   ...
   18.  United States  32/km^2 (178th)
</code></pre>
Sweden manages to be #5 with a smaller population density than the United States.<p>source: Wikipedia