This paper measures regional social capital from 2000 to 2010 using linear interpolation and principal component analysis with the Statistics Korea survey data on ``society`` and ``lifestyle``. We find that the measured regional social capital grows about twice from 2000 to 2010, and the capital for the late sample years is greater in metropolitan cities, such as, Seoul, while it is greater in non-metropolitan cities for the early sample years. In particular, the social capital of Seoul grows 6.8 times during the sample years, which is much greater than the national average growth. In addition, it is found that the social capital is positively related with economic performance factors: per capital income, income growth, unemployment rate, and Japanese FDI. The positive relation suggests that the social capital may play an important role in encouraging economic growth by reducing transaction cost and information cost as well as by strengthening learning effect.