Herlisberg is first mentioned in 1173 as Heigesperhc. In 1242 it was mentioned as Hergesberch.
Geography
Römerswil is located in the Seetal valley. It lies to the west of the district capital of Hochdorf, from Huwyl and from Lake Baldegg. The municipality has an area of. Of this area, 77% is used for agricultural purposes, while 16.3% is forested. Of the rest of the land, 6.5% is settled and the remainder is non-productive. , 16.22% of the total land area was forested. Of the agricultural land, 68.53% is used for farming or pastures, while 8.53% is used for orchards or vine crops. Of the settled areas, 3.3% is covered with buildings, 0.3% is industrial, 0.66% is classed as special developments, 0.12% is parks or greenbelts and 2.16% is transportation infrastructure. Of the unproductive areas, 0.06% is unproductive flowing water and 0.12% is other unproductive land. On 1 January 2005, the formerly independent municipality of Herlisberg, lying to the northwest, was united with Römerswil.
Demographics
Römerswil has a population of. , 3.3% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 5.1%. Most of the population speaks German , with Serbo-Croatian being second most common and French being third. In the 2007 election the most popular party was the CVP which received 41% of the vote. The next three most popular parties were the SVP, the FDP and the Green Party. The age distribution in Römerswil is; 438 people or 27.8% of the population is 0–19 years old. 409 people or 25.9% are 20–39 years old, and 528 people or 33.5% are 40–64 years old. The senior population distribution is 156 people or 9.9% are 65–79 years old, 44 or 2.8% are 80–89 years old and 2 people or 0.1% of the population are 90+ years old. In Römerswil about 74.7% of the population have completed either non-mandatory upper secondary education or additional higher education. there are 495 households, of which 94 households contain only a single individual. 88 or about 17.8% are large households, with at least five members. there were 327 inhabited buildings in the municipality, of which 215 were built only as housing, and 112 were mixed use buildings. There were 166 single family homes, 29 double family homes, and 20 multi-family homes in the municipality. Most homes were either two or three story structures. There were only 15 single story buildings and 9 four or more story buildings. Römerswil has an unemployment rate of 0.48%. , there were 249 people employed in the primary economic sector and about 91 businesses involved in this sector. 152 people are employed in the secondary sector and there are 16 businesses in this sector. 88 people are employed in the tertiary sector, with 18 businesses in this sector. 53.5% of the population of the municipality were employed in some capacity. At the same time, females made up 38.8% of the workforce. the religious membership of Römerswil was; 1,220 were Roman Catholic, and 99 were Protestant, with an additional 11 that were of some other Christian faith. There are 13 individuals who are Muslim. Of the rest; there was 1 individuals who belong to another religion, 79 who do not belong to any organized religion, 45 who did not answer the question. The historical population or Herlisberg alone is given in the following table:
