Joyce Abma is a demographer and Linda J. Piccinino is a statistician/demographer with the Reproductive Statistics Branch of the National Center for Health Statistics, Hyattsville, MD. Support for this research was provided by grant 1 RO1 HD33241-01 from the National Institutes of Health. Work on this project was initiated by Lindy Williams and Kathy London. Kathy London's untimely death was a great loss to the demographic community in general and to this project in particular. She contributed substantially to this research, and this article is dedicated to her memory. An earlier version of this paper was presented at the annual meeting of the Rural Sociological Society, Washington, DC, August 1995. The authors would like to thank Don Hayes and Michael Rendall for comments on an earlier draft.