In het postcodegebied 1821 is het aantal inwoners sinds 1998 als volgt opgebouwd :
| Jaar | Inwoners | Groei |
| 1998 | 1,375 | |
| 1999 | 1,345 | -2.18% |
| 2000 | 1,320 | -1.86% |
| 2001 | 1,320 | 0.00% |
| 2002 | 1,265 | -4.17% |
| 2003 | 1,055 | -16.60% |
| 2004 | 985 | -6.64% |
| 2005 | 1,020 | 3.55% |
| 2006 | 1,230 | 20.59% |
| 2007 | 1,235 | 0.41% |
| 2008 | 1,225 | -0.81% |
| 2009 | 1,225 | 0.00% |
| 2010 | 1,230 | 0.41% |
| 2011 | 1,280 | 4.07% |
| .2012 | 1,300 | 1.56% |
| 2013 | 1,285 | -1.15% |
| 2014 | 1,320 | 2.72% |
| 2015 | 1,445 | 9.47% |
| 2016 | 1,555 | 7.61% |
| 2017 | 1,635 | 5.14% |
| 2018 | 1,640 | 0.31% |
| 2019 | 1,650 | 0.61% |
| 2020 | 1,635 | -0.91% |