The towns that served as provincial capitals in Hà Bắc province were Bắc Giang town and Bắc Ninh town. Bắc Giang was the provincial capital, and Bắc Ninh was another town within the province. This information is supported by the Wikipedia page on Hà Bắc province, which states that in early 1996, the province had two towns, including Bắc Giang town as the provincial capital, and Bắc Ninh. For more detailed information, you can refer to the Wikipedia page.