(or 24.6%) persons who were part of a couple without children, and 4,585 (or 50.5%) who were part of a couple with children. There were 473 (or 5.2%) people who lived in single parent home, while there are 44 persons who were adult children living with one or both parents, 46 persons who lived in a household made up of relatives, 55 who lived in a household made up of unrelated persons, and 277 who are either institutionalized or live in another type of collective housing. The vacancy rate for the municipality, , was 2.63%. , the construction rate of new housing units was 12.3 new units per 1000 residents. there were 4,442 apartments in the municipality. The most common apartment size was the 4 room apartment of which there were 1,448. There were 171 single room apartments and 495 apartments with six or more rooms. In the 2007 federal election the most popular party was the SVP which received 35.31% of the vote. The next three most popular parties were the SP (16.03%), the CVP (14.78%) and the FDP (13.58%). In the federal election, a total of 2,450 votes were cast, and the voter turnout was 42.9%. The historical population is given in the following table: Heritage sites of national significance The Old Paritätische Church, Harbor, Catholic Church of St Johannes der Täufer are listed as Swiss heritage site of national significance. The entire village of Romanshorn is listed in the Inventory of Swiss Heritage Sites. Economy , Romanshorn had an unemployment rate of 3.13%. , there were 81 people employed in the primary economic sector and about 29 businesses involved in this sector. 2,137 people are employed in the secondary sector and there are 90 businesses in this sector. 3,085 people are employed in the tertiary sector, with 345 businesses in this sector. there were 5,805 workers who lived in the municipality. Of these, 2,038 or about 35.1% of the residents worked outside Romanshorn while 2,820 people commuted into the municipality for work. There were a total of 6,587 jobs (of at least 6 hours per week) in the municipality. Of the working population, 12% used public transportation to get to work, and 40.4% used a private car. Companies in Romanshorn Eftec AG Fatzer AG Geobrugg AG Eugster/Frismag AG Transportation Romanshorn railway station, opened in 1855, forms the junction between the Winterthur–Romanshorn railway, the Schaffhausen–Rorschach railway and the