This paper investigated the difference of usage of the sentence-final particles of bai and tai that are used in the Fukuoka dialect from a sociolinguistic variation study perspective. Social factors such as age, gender and social network were gathered through a survey, in which the results were analyzed, and patterns identified. The study showed that there is a decline in the usage of bai and tai, especially bai as many informants’ usage of the particle differed from what has been found from prior research. By looking at the different social factors, the study shows differences between how the sentence-final particles are used, especially in relation to gender and age. The study concluded that women from two out of three age groups tend to not use the particles while men and the third age group which are older informants tend to still use the particles. These results showed that there may be a language change within the Fukuoka dialect, but that more research needs to be conducted to say for sure, as there were not enough informants representing all age cohorts.