Today, the growth of data in the world is very significant, including government data. To generate value from these data, the Indonesian Government establish an Open Government Data (OGD) initiative, through Satu Data Indonesia (SDI). BPS, as an SDI coach, has an open data portal which is a guideline for other agencies in Indonesia. Therefore, assessment to BPS open data portal is important, because it will be a benchmark for the success of OGD in Indonesia. The measurement was conduct using Open Data Maturity Measurement (OD-MM), by providing questionnaires for the three SMEs at BPS, filled with interview. From the domains assessed, the result shows that the maturity level rate of BPS open data portal is at level 3 on a score from 1 to 4. This means that there are procedures and standards in implementing OGD, but their implementation is still limited to formalization of activities.