Brenna is a comune (municipality) in the Province of Como in the Italian region Lombardy, located about 30km north of Milan and about 11km southeast of Como. As of 31 December 2004, it had a population of 1,860 and an area of 4.9km2.Brenna borders the following municipalities: Alzate Brianza, Cantù, Carugo, Inverigo, Mariano Comense.Demographic evolution Colors= id:lightgrey value:gray id:darkgrey value:gray id:sfondo value:rgb id:barra value:rgbImageSize = width:455 height:303 PlotArea = left:50 bottom:50 top:30 right:30 DateFormat = x.y Period = from:0 till:3000 TimeAxis = orientation:vertical AlignBars = justify ScaleMajor = gridcolor:darkgrey increment:1000 start:0 ScaleMinor = gridcolor:lightgrey increment:200 start:0 BackgroundColors = canvas:sfondoBarData= bar:1861 text:1861 bar:1871 text:1871 bar:1881 text:1881 bar:1901 text:1901 bar:1911 text:1911 bar:1921 text:1921 bar:1931 text:1931 bar:1936 text:1936 bar:1951 text:1951 bar:1961 text:1961 bar:1971 text:1971 bar:1981 text:1981 bar:1991 text:1991 bar:2001 text:2001PlotData= color:barra width:20 align:leftbar:1861 from: 0 till:907 bar:1871 from: 0 till:941 bar:1881 from: 0 till:984 bar:1901 from: 0 till:997 bar:1911 from: 0 till:1085 bar:1921 from: 0 till:1213 bar:1931 from: 0 till:1060 bar:1936 from: 0 till:1098 bar:1951 from: 0 till:1144 bar:1961 from: 0 till:1283 bar:1971 from: 0 till:1354 bar:1981 from: 0 till:1474 bar:1991 from: 0 till:1686 bar:2001 from: 0 till:1817