Augst has a population () of . , 16.7% of the population are resident foreign nationals. Over the last 10 years (1997–2007) the population has changed at a rate of 10.6%. Its population was comparable to its current level around 1910, or the early twentieth century. Most of the population () speaks
German (804 or 84.6%), with
Italian language and
Serbo-Croatian being second and third most common (28 or 2.9%). There are 17 people who speak
French and 1 person who speaks
Romansh. , there were 350 people who were single and never married in the municipality. There were 514 married individuals, 44 widows or widowers and 42 individuals who are divorced. , there were 407 private households in the municipality, and an average of 2.3 persons per household. there were 454 apartments in the municipality. The most common apartment size was 4 rooms of which there were 144. There were 20 single room apartments and 134 apartments with five or more rooms. Of these apartments, a total of 391 apartments (86.1% of the total) were permanently occupied, while 43 apartments (9.5%) were seasonally occupied and 20 apartments (4.4%) were empty. The vacancy rate for the municipality, , was 0.22%. Colors= id:lightgrey value:gray(0.9) id:darkgrey value:gray(0.8) ImageSize = width:1080 height:210 PlotArea = height:150 left:100 bottom:50 right:100 AlignBars = justify DateFormat = x.y Period = from:0 till:950 TimeAxis = orientation:vertical AlignBars = justify ScaleMajor = gridcolor:darkgrey increment:200 start:0 ScaleMinor = gridcolor:lightgrey increment:40 start:0 PlotData= color:yellowgreen width:40 mark:(line,white) align:center bar:1699 from:start till:142 text:"142" bar:1798 from:start till:130 text:"130" bar:1850 from:start till:369 text:"369" bar:1860 from:start till:357 text:"357" bar:1870 from:start till:405 text:"405" bar:1880 from:start till:402 text:"402" bar:1888 from:start till:421 text:"421" bar:1900 from:start till:501 text:"501" bar:1910 from:start till:772 text:"772" bar:1920 from:start till:607 text:"607" bar:1930 from:start till:646 text:"646" bar:1941 from:start till:592 text:"592" bar:1950 from:start till:672 text:"672" bar:1960 from:start till:860 text:"860" bar:1970 from:start till:863 text:"863" bar:1980 from:start till:836 text:"836" bar:1990 from:start till:786 text:"786" bar:2000 from:start till:950 text:"950" ==Heritage sites of national significance==