By now, the criticality of informal sector in developing economies is well established and the sector is no longer viewed as an intermediary phase towards formalisation. Informal/unorganised sector employment accounts for about 84 per cent of total employment in 2011-12 and for women its share is as high as 96 per cent. The link between the growth of informal sector and rural- urban migration has long been recognised. Since the expansion of informal sector in the 1970s, rural- urban labour migration has been showing an increasing trend. Male migration has been at the centre of such analysis as female labour migration was often considered to be insignificant (with all national level data showing a negligible proportion of women migrating for employment reasons). However, 62 per cent of urban migrants are females in 2007-08, and they accounted for 46 per cent of urban females. What is noteworthy in the context of female migration is the increase in the rate of female migration over the years. In 1993, only 38 per cent of urban female populations were migrants as compared to 46 per cent in 2007-08. The case of female migration becomes all the more interesting in comparison to the changes in male migration. Between 1993 and 2007-08, male migration increased by only 2 per cent from 24 per cent to 26 per cent in urban areas.