English is considered the most irreplaceable lingua franca in the world. A total of 55 countries uses English as a second official language, and many programs have made English instruction a mandatory part of national education. In order to promote globalization and increase the competitiveness of citizens, many governments strive to improve citizens’ English abilities. In 2018, Taiwan's Executive Yuan launched the 2030 Bilingual National Policy Development Blueprint with the aim of making Taiwan a bilingual country. This study investigated the attitudes of English teachers in classrooms when interacting with students and creating opportunities for students to interact with others in English and the teachers’ willingness to communicate (WTC) in everyday situations using English. The study also investigated the relationship between teachers’ attitudes toward classroom interaction and their willingness to communicate in English and to compare attitudes toward L2 classroom interaction and WTC of teachers in low- and high-population density areas. A total of 215 English teachers from different administrative districts in Taoyuan City participated in this study. Results showed that teachers’ attitudes towards using English in interactive teaching and teachers’ L2 willingness to communicate were significantly positive. Also, teachers’ attitudes towards using English in teaching and their L2 willingness to communicate were positively correlated. Finally, the results showed there was no significant difference between teachers from low- and high-population areas in attitudes toward L2 classroom interaction and L2 WTC. These results have important implications for English education and policy makers in Taiwan.