The labour force participation is nearly universal for prime-aged persons in less developed countries, whereas its incidence is considerably lower for younger and older persons [Bloom and Freeman (1987)]. The objective of this paper is to investigate the role of socioeconomic and demographic determinants in participation of respondents in labour force. The data was obtained from Pakistan Labour Force Survey 2009-10 which was conducted by Federal Bureau of Statistics. The dependent variable has dichotomous response; participation and non participation and independent variables are demographic; age, sex, marital status, area and in socioeconomic variables used education levels of person’s, location of work and migration status. The Hierarchical Log-linear model has been used to identify model that best describing the relationship between these categorical variables. The results showed that factors such as age, sex, marital status, education level, and migration status and work location play a significant role in labour force participation.