Echarlens has a population () of . , 11.9% of the population are resident foreign nationals. Over the last 10 years (2000–2010) the population has changed at a rate of 20.6%. Migration accounted for 17.8%, while births and deaths accounted for 5.9%. Most of the population () speaks
French (510 or 92.4%) as their first language,
German is the second most common (18 or 3.3%) and
Portuguese is the third (12 or 2.2%). There are 2 people who speak
Italian and 1 person who speaks
Romansh. Of the population in the municipality, 161 or about 29.2% were born in Echarlens and lived there in 2000. There were 232 or 42.0% who were born in the same canton, while 71 or 12.9% were born somewhere else in Switzerland, and 67 or 12.1% were born outside of Switzerland. , there were 207 private households in the municipality, and an average of 2.6 persons per household. , the construction rate of new housing units was 10 new units per 1000 residents. Colors= id:lightgrey value:gray(0.9) id:darkgrey value:gray(0.8) ImageSize = width:1020 height:210 PlotArea = height:150 left:100 bottom:50 right:100 AlignBars = justify DateFormat = x.y Period = from:0 till:560 TimeAxis = orientation:vertical AlignBars = justify ScaleMajor = gridcolor:darkgrey increment:100 start:0 ScaleMinor = gridcolor:lightgrey increment:20 start:0 PlotData= color:yellowgreen width:40 mark:(line,white) align:center bar:1811 from:start till:518 text:"518" bar:1850 from:start till:440 text:"440" bar:1860 from:start till:418 text:"418" bar:1870 from:start till:403 text:"403" bar:1880 from:start till:407 text:"407" bar:1888 from:start till:423 text:"423" bar:1900 from:start till:446 text:"446" bar:1910 from:start till:431 text:"431" bar:1920 from:start till:479 text:"479" bar:1930 from:start till:421 text:"421" bar:1941 from:start till:421 text:"421" bar:1950 from:start till:426 text:"426" bar:1960 from:start till:392 text:"392" bar:1970 from:start till:337 text:"337" bar:1980 from:start till:344 text:"344" bar:1990 from:start till:416 text:"416" bar:2000 from:start till:552 text:"552" ==Heritage sites of national significance==