ObjectiveTo identify the extent of demand for birth spacing, according to age and parity among married women of reproductive age (MWRA) in developing countries. Methods Secondary analysis of data from the Demographic and Health Surveys (DHS) using cross-tabulations. Data collected from nationally representative samples of MWRA in selected developing countries between 1990 and 2004. Results Demand for birth spacing is the most prevalent reason for an interest in family planning among married women aged 15–29 years in the majority of developing countries examined. In the 15–19-year age cohort, the demand for spacing is proportionally the most prevalent reason for a demand for family planning. A demand for spacing even exists among young, zero-parity married women in each country examined. Findings on the demand for spacing among zero-parity married women quantifies the expressed desire of some married women in developing countries to postpone a first birth or the timing of a first pregnancy. Conclusion The substantial demand for birth spacing among young, low- and zero-parity women suggests that family planning programs in developing countries may need to reevaluate how accessible services are for this cohort of potential contraception users. Currently, many service-delivery protocols, counseling practices and service provider training may not fully address the needs of younger, low- or zero-parity clients.