| Rank | Country | Radio broadcast stations AM density |
| San Marino |  void |
122 | Sao Tome and Principe |  206,178 people per AM Radio broadcast station |
73 | Saudi Arabia |  654,917 people per AM Radio broadcast station |
46 | Senegal |  1,606,658 people per AM Radio broadcast station |
| Serbia |  void |
| Serbia and Montenegro | void |
154 | Seychelles |  82,247 people per AM Radio broadcast station |
15 | Sierra Leone |  6,294,774 people per AM Radio broadcast station |
| Singapore |  void |
93 | Slovakia |  363,694 people per AM Radio broadcast station |
123 | Slovenia |  200,772 people per AM Radio broadcast station |
79 | Solomon Islands |  581,318 people per AM Radio broadcast station |
| Somalia |  void |
30 | South Africa |  3,127,580 people per AM Radio broadcast station |
| South Georgia and the South Sandwich Islands | void |
| Southern Ocean | void |
126 | Spain |  194,669 people per AM Radio broadcast station |
| Spratly Islands | void |
55 | Sri Lanka |  1,408,585 people per AM Radio broadcast station |
28 | Sudan |  3,351,538 people per AM Radio broadcast station |
141 | Suriname |  118,999 people per AM Radio broadcast station |
201 | Svalbard |  2,165 people per AM Radio broadcast station |
92 | Swaziland |  376,272 people per AM Radio broadcast station |
9 | Sweden |  9,045,389 people per AM Radio broadcast station |
40 | Switzerland |  1,895,380 people per AM Radio broadcast station |
54 | Syria |  1,410,542 people per AM Radio broadcast station |
128 | Taiwan |  163,722 people per AM Radio broadcast station |
66 | Tajikistan |  901,486 people per AM Radio broadcast station |
29 | Tanzania |  3,351,097 people per AM Radio broadcast station |
109 | Thailand |  275,182 people per AM Radio broadcast station |
| Timor-Leste |  void |