Buch am Irchel has a population (as of 31 December 2018) of . s of 2007[ [update]], 5.0% of the population was made up of foreign nationals. Over the last 10 years the population has grown at a rate of 17.5%. Most of the population (as of 2000[ [update]]) speaks German (98.4%), with English and Spanish being the second most common ( 0.3%).