| Rank | Country | Radio broadcast stations shortwave density |
137 | Sao Tome and Principe |  206,178 people per shortwave Radio broadcast station |
24 | Saudi Arabia |  14,080,709 people per shortwave Radio broadcast station |
26 | Senegal |  12,853,259 people per shortwave Radio broadcast station |
| Serbia |  void |
| Serbia and Montenegro | void |
147 | Seychelles |  41,124 people per shortwave Radio broadcast station |
49 | Sierra Leone |  6,294,774 people per shortwave Radio broadcast station |
90 | Singapore |  2,304,084 people per shortwave Radio broadcast station |
82 | Slovakia |  2,727,704 people per shortwave Radio broadcast station |
| Slovenia |  void |
122 | Solomon Islands |  581,318 people per shortwave Radio broadcast station |
36 | Somalia |  9,558,666 people per shortwave Radio broadcast station |
3 | South Africa |  43,786,115 people per shortwave Radio broadcast station |
| South Georgia and the South Sandwich Islands | void |
| Southern Ocean | void |
4 | Spain |  40,491,051 people per shortwave Radio broadcast station |
| Spratly Islands | void |
58 | Sri Lanka |  5,282,194 people per shortwave Radio broadcast station |
5 | Sudan |  40,218,455 people per shortwave Radio broadcast station |
126 | Suriname |  475,996 people per shortwave Radio broadcast station |
| Svalbard |  void |
130 | Swaziland |  376,272 people per shortwave Radio broadcast station |
38 | Sweden |  9,045,389 people per shortwave Radio broadcast station |
66 | Switzerland |  3,790,760 people per shortwave Radio broadcast station |
19 | Syria |  19,747,586 people per shortwave Radio broadcast station |
127 | Taiwan |  467,775 people per shortwave Radio broadcast station |
69 | Tajikistan |  3,605,942 people per shortwave Radio broadcast station |
18 | Tanzania |  20,106,581 people per shortwave Radio broadcast station |
33 | Thailand |  10,915,550 people per shortwave Radio broadcast station |
| Timor-Leste |  void |