Romairon is a former municipality in the district of Jura-Nord Vaudois in the canton of Vaud in Switzerland.

[2] Romairon has an area, as of 2009[update], of 4.89 square kilometers (1.89 sq mi).

[4] The municipality is located in mountains between Chasseron and Mont Aubert, on the border with the Val-de-Travers.

The blazon of the municipal coat of arms is Or, on a Bend Vert a May-beetle proper bendwise.

[7] The age distribution, as of 2009[update], in Romairon is; 1 child is between 0 and 9 years old and 4 teenagers or 10.8% are between 10 and 19.

[10] About 43.8% of the total households were owner occupied, or in other words did not pay rent (though they may have a mortgage or a rent-to-own agreement).

Of the rest of the households, there are 5 married couples without children, 5 married couples with children[8] In 2000[update] there were 8 single family homes (or 44.4% of the total) out of a total of 18 inhabited buildings.

[6] The historical population is given in the following chart:[2][13] In the 2007 federal election the most popular party was the FDP which received 33.02% of the vote.

In the federal election, a total of 18 votes were cast, and the voter turnout was 56.3%.

[6] There were 16 residents of the municipality who were employed in some capacity, of which females made up 37.5% of the workforce.

[6] From the 2000 census[update], 4 or 10.8% were Roman Catholic, while 32 or 86.5% belonged to the Swiss Reformed Church.

In the Vaud cantonal school system, two years of non-obligatory pre-school are provided by the political districts.

[17] During the school year, the political district provided pre-school care for a total of 578 children of which 359 children (62.1%) received subsidized pre-school care.

The canton's primary school program requires students to attend for four years.