of Ober- and Unter-Roggwil which grew together and a number of hamletsincluding Mammertshofen. Demographics Roggwil has a population () of . , 9.4% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 22.2%. Most of the population () speaks German (95.7%), with Italian being second most common ( 1.0%) and English being third ( 0.5%). , the gender distribution of the population was 49.6% male and 50.4% female. The population was made up of 1,295 Swiss men (44.8% of the population), and 141 (4.9%) non-Swiss men. There were 1,325 Swiss women (45.8%), and 132 (4.6%) non-Swiss women. In there were 32 live births to Swiss citizens and births to non-Swiss citizens, and in same time span there were 13 deaths of Swiss citizens and 1 non-Swiss citizen death. Ignoring immigration and emigration, the population of Swiss citizens increased by 19 while the foreign population decreased by 1. There was 1 Swiss man, 2 Swiss women who emigrated from Switzerland to another country, 16 non-Swiss men who emigrated from Switzerland to another country and 18 non-Swiss women who emigrated from Switzerland to another country. The total Swiss population change in 2008 (from all sources) was an increase of 40 and the non-Swiss population change was an increase of 40 people. This represents a population growth rate of 2.8%. The age distribution, , in Roggwil is; 387 children or 13.5% of the population are between 0 and 9 years old and 379 teenagers or 13.2% are between 10 and 19. Of the adult population, 275 people or 9.6% of the population are between 20 and 29 years old. 362 people or 12.6% are between 30 and 39, 549 people or 19.1% are between 40 and 49, and 385 people or 13.4% are between 50 and 59. The senior population distribution is 286 people or 10.0% of the population are between 60 and 69 years old, 149 people or 5.2% are between 70 and 79, there are 91 people or 3.2% who are between 80 and 89, and there are 9 people or 0.3% who are 90 and older. , there were 934 private households in the municipality, and an average of 2.6 persons per household. there were 408 single family homes (or 82.4% of the total) out of a total of 495 inhabited buildings. There were 38 two family buildings (7.7%),