the total area while housing and buildings made up 11.3% and transportation infrastructure made up 5.1%. Power and water infrastructure as well as other special developed areas made up 4.0% of the area while parks, green belts and sports fields made up 1.6%. 34.9% of the total land area was heavily forested. Of the agricultural land, 29.1% is used for growing crops and 4.2% is pastures, while 1.8% is used for orchards or vine crops. The municipality is located on the western edge of the Birrfelds, and has grown together with the municipality of Lupfig to the north. It consists of the haufendorf village (an irregular, unplanned and quite closely packed village, built around a central square) of Birr. The municipalities of Birr and Birrhard are considering a merger on 1 January 2014 into a new municipality which will be known as Birr. Coat of arms The blazon of the municipal coat of arms is Azure a Pear Or slipped and leaved Vert. This is an example of canting because of the pear (). Demographics Birr has a population () of . 44.5% of the population are foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 18.7%. Most of the population () speaks German (71.2%), with Italian being second most common ( 7.2%) and Serbo-Croatian being third ( 6.7%). The age distribution, , in Birr is; 488 children or 12.0% of the population are between 0 and 9 years old and 524 teenagers or 12.9% are between 10 and 19. Of the adult population, 592 people or 14.6% of the population are between 20 and 29 years old. 568 people or 14.0% are between 30 and 39, 639 people or 15.7% are between 40 and 49, and 556 people or 13.7% are between 50 and 59. The senior population distribution is 405 people or 10.0% of the population are between 60 and 69 years old, 212 people or 5.2% are between 70 and 79, there are 73 people or 1.8% who are between 80 and 89, and there are 8 people or 0.2% who are 90 and older. the average number of residents per living room was 0.56 which is about equal to the cantonal average of 0.57 per room. In this case, a room is defined as space of a housing unit of at least as normal bedrooms, dining rooms, living rooms,