27.3% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 0.8%. Most of the population () speaks German (83.7%), with Albanian being second most common ( 3.3%) and Italian being third ( 2.9%). , the gender distribution of the population was 48.6% male and 51.4% female. The population was made up of 3,231 Swiss men (34.0% of the population), and 1,383 (14.6%) non-Swiss men. There were 3,669 Swiss women (38.7%), and 1,207 (12.7%) non-Swiss women. In there were 48 live births to Swiss citizens and 27 births to non-Swiss citizens, and in same time span there were 89 deaths of Swiss citizens and 6 non-Swiss citizen deaths. Ignoring immigration and emigration, the population of Swiss citizens decreased by 41 while the foreign population increased by 21. There were 14 Swiss men who emigrated from Switzerland to another country, 6 Swiss women who emigrated from Switzerland to another country, 65 non-Swiss men who emigrated from Switzerland to another country and 60 non-Swiss women who emigrated from Switzerland to another country. The total Swiss population change in 2008 (from all sources) was an increase of 56 and the non-Swiss population change was an increase of 114 people. This represents a population growth rate of 1.8%. The age distribution, , in Romanshorn is; 837 children or 8.7% of the population are between 0 and 9 years old and 1,158 teenagers or 12.1% are between 10 and 19. Of the adult population, 1,272 people or 13.2% of the population are between 20 and 29 years old. 1,109 people or 11.5% are between 30 and 39, 1,486 people or 15.5% are between 40 and 49, and 1,339 people or 13.9% are between 50 and 59. The senior population distribution is 1,035 people or 10.8% of the population are between 60 and 69 years old, 768 people or 8.0% are between 70 and 79, there are 499 people or 5.2% who are between 80 and 89, and there are 103 people or 1.1% who are 90 and older. , there were 3,858 private households in the municipality, and an average of 2.3 persons per household. there were 942 single family homes (or 64.8% of the total) out of a total of 1,454 inhabited buildings. There were 160 two family buildings (11.0%), 137 three family buildings (9.4%) and 215 multi-family buildings (or 14.8%). There were 2,232