This article presents the informal recycling sector’s (IRS) social, economic driving factors in five cities in Indonesia and their contribution to waste management in the cities. An on-field analysis was conducted by random and incidental sampling method of questionnaire administration followed by observation. Among the respondents (n = 178), 79% of individuals were waste pickers, 15% were small-scale waste collectors, and 6% were medium-scale waste collectors. The majority of the waste pickers sampled are male (79%). The amount of waste collected by individual waste pickers is 43.87 kg person⁻¹ day⁻¹, a corresponding recycling rate of approximately 12%, and an average monthly income of US$91.7. Gender differences are apparent as the male waste pickers generated higher incomes than those earned by their female counterparts (US$128.3 for men and US$69.7 for women) even as their average work hours are similar to that of the men (7.8 and 7.6 hours day⁻¹, respectively). Economic motives are the respondents’ primary driving factors as moving to large cities accompanied by their family members. The study concluded that the IRS plays substantial contribution to waste management; further integrating them into the waste management system via IRS association, additional investment, formulation of law and policies and efforts by municipalities can give various benefits for involved stakeholders, the community and the environment. The results can serve as a significant reference for improving the solid waste recycling system and informal sector management in Indonesian cities and other developing countries.