Radios were first used by the general public in the 1920s. Now there are 2.6 billion radios in use worldwide. In 13 territories there are more radios in use than people living there. 55 more territories averaged more than one radio for every two people. Altogether 126 territories had one or more radios for every four people (the world average household size is 4).
The most radios per person are in Norway - at more than 3 per person. Radios might be found in the kitchen, the car, and even the shower. By contrast there is only 1 radio in use for every 50 people in Haiti. Radios are an excellent means of communication: many people find reading difficult, a much smaller number cannot hear.