This research studied married trends of Thai women and living arrangements of unmarried elderly women, aged 50 years and over in Kanchanaburi province. Quantitative and qualitative research was used to achieve the objectives. For quantitative data, information was gathered from 2 secondary data sources (1) the 1960 – 2000, Thai Population and Housing Census of National Statistical Office and (2) the Kanchanaburi Project round 1 – 4, 2000 – 2003. For qualitative data, in – depth interviews by selecting unmarried elderly women as representatives from the demographic surveillance system, Kanchanaburi Project were conducted. The study found that during the past 40 years; 1960 – 2000, Thai women tend to postpone their age at which they are first married and the number of unmarried and celibate women have gradually increased. The study of living arrangements shows that most unmarried elderly women live with others, meaning their siblings and cousins. The reason for remaining unmarried, as given by elderly women, is a love of independence, they can not find a spouse satisfy them, they feel wary of being married and have strict standards for selecting a spouse of their household. In addition, higher education and work status are important reasons to remain unmarried and be single and are push factors for living alone, among women. Most celibate women tend to live with their parents and do not move anywhere. When their parents pass away, they tend to live alone or live with cousins as usual or live with their grandchildren. Moreover, unmarried elderly women are more “givers” than “receivers” to their relatives, especially in money issues since support from the government sector seems to be less. Besides this, unmarried elderly women sometimes realize the importance of having good health since they have no one living with them. When unmarried elderly women living alone get older, they worry about their dwelling place in the future.