The objective of this paper is twofold: to study the communication process found among Northeastern Thai widely known as “Isan” workers, who have moved to work in Bangkok area, and to examine the impacts of communication on ways of life and career of these workers. By employing an in-depth interview technique, the data was collected from informants selected through a purposive sampling method; and it was analyzed on a content basis. The findings also suggest that age and social context are two main factors influencing the use of spoken languages Central (standard) Thai and Northeastern Thai (Isan) in their everyday communications. As both message senders and receivers, the workers usually interact among themselves about jobs, living expenses, livelihood and weather through both face-to-face communications and mobile phone. Meanwhile, they are inclined to perform face-to-face communications with non-Isan co-workers on various non-private issues. Interestingly, these workers, those under 25 years of age in particular, seem to have less confidence in using their own dialect in communications with non-Isan co-workers. They speak Isan only to co-workers from the same region, and they are more likely to speak standard Thai, with slight tonal and accentual differences, even though some Isan co-workers are present in conversations. In addition, the mix of Isan to standard Thai-Isan in conversations is thought by certain Isan workers as a drawback of language switching. Because of the great number of Bangkok population of Isan origin as well as the increasing popularity of Isan culture primarily found in everyday conversations, cuisine, TV shows, and movies, the language typical of Thailand’s poorest and least developed region is more or less understandable by many Thai people from other regions. In the eyes of certain workers from the Northeast, therefore, Isan is not an obstacle to communications. Instead, it could bring amusement and enjoyment to conversations. For this reason, they hardly feel offended by language jokes made by people from other regions.