Altenburg-Nord:
| 1977 | 1980 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Einwohner | 6.000 | 13.000 | 13.101 | 12.572 | 11.944 | 11.006 | 10.015 | 9.226 | 8.460 | 7.911 | 7.518 | 7.216 | 6.879 | 6.626 | 6.284 | 6.035 | 5.789 | 5.610 |
| Bevölkerungsdichte | 4.138 | 8.966 | 9.035 | 8.670 | 8.237 | 7.590 | 6.907 | 6.363 | 5.834 | 5.456 | 5.185 | 4.977 | 4.744 | 4.570 | 4.334 | 4.162 | 3.992 | 3.869 |
Altenburg-Südost:
| 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Einwohner | 6.482 | 6.264 | 6.026 | 5.949 | 5.815 | 5.618 | 5.450 | 5.327 | 5.144 | 5.042 | 4.946 | 4.843 | 4.839 | 4.747 | 4.647 | 4.551 |
| Bevölkerungsdichte | 5.947 | 5.747 | 5.528 | 5.458 | 5.335 | 5.154 | 5.000 | 4.887 | 4.719 | 4.626 | 4.538 | 4.443 | 4.439 | 4.355 | 4.263 | 4.175 |