| Party Affiliation of Registered Trade Unions in Chandigarh (2001 to 2004 and 2006 to 2009 and 2011)* | ||
| Central Organisation | No. of Trade Unions Submitted Returns | Membership |
| 2001 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2002 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2003 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2004 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2006 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2007 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2008 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2009 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
| 2011 | ||
| Indian National Trade Union Congress | ||
| All India Trade Union Congress | ||
| Bhartiya Mazdoor Sangh | ||
| Hind Mazdoor Sangh | ||
| Centre of India Trade Union | ||
| Others | ||
| Total | ||
