Using a four-way definition of living arrangements (independent, live with parents, cohabit, share with others) and data from the 1990 Survey of Income and Program Participation, I find that single mothers have a 26 percent probability of switching living arrangements at least once during a 32-month period. Mothers living independently are the least likely to change arrangements, and those sharing housing with individuals other than a boyfriend or parents are the most likely to switch. Having lived for a longer period of time in any of the four arrangements decreases the probability of switching. Among those who change living arrangements, there appear to be some patterns of transition. Mothers living with their parents tend to move into either independent households or those that they share with individuals other than an unrelated man. If they leave, mothers who lived with their parents tend not to move back into their parents' household, at least within the time period examined. Women who share with others or cohabit tend to cycle between their current living arrangement and living independently. Among those who switch living arrangements, mothers who do not live independently tend to have transitions into independence or other arrangements which increase the probability they will choose independence in the future.