Community and hospital based studies were conducted to assess the major factors related to the practice of family planning during 1989 and 1990 in Central Sudan. The mothers of 1592 births in the community and 1357 births in the hospital were interviewed by trained study workers. Prevalence of contraceptive use prior to current pregnancy was 13.0% and knowledge of a family planning method was 43.0% among hospital women and 51.0% among community women. The major predictors of use of a family planning method were parity, socioeconomic status, knowledge of source of service and maternal age. The average completed family size was 7.7 children and with the exception of a lengthy breast feeding duration, the factors examined favored a high fertility. Women preferred and apparently practiced behaviors conducive to spacing rather than limiting the number of their children. The results between the hospital, the community, and the Sudan Demographic and Health Survey 1989/1990 were consistent suggesting a minimal effect of selection bias and increasing the validity of these findings. Accessible and available family planning services coupled with wider information on family planning through health personnel and the media are needed. In particular, special efforts should be made to reach women of low socioeconomic status.