The goals of the previous research project (2006-2010) and current one (2011-2014), funded by the Serbian Ministry of Science, now Ministry of Education and Science, is the systematic indoor radon survey in elementary schools of Serbia. This survey has been under way since 2008 through an international collaboration, involving so far 340 schools in 13 communities within two districts of South Serbia. The field activities were divided into two phases: Part 1(encompassing 6 communities with 124 elementary schools) and Part 2 (encompassing another 206 elementary schools). In this paper the results of radon concentration measurement for 206 schools in 7 communities (Part 2) are provided. The number of rooms monitored per school, depending on school size, ranged from 1 to 10, with an average of 1.8 rooms. In each monitored room, two CR-39 detectors were exposed side-by-side for two consecutive six-month periods. For each school, the annual radon concentration average of the monitored rooms was calculated. The arithmetic mean of the 206 annual averages is 118 Bq/m3 with a standard deviation of 78 Bq/m3. The minimum radon concentration is 17 Bq/m3, and the maximum 428 Bq/m3. The median is 96 Bq/m3, with the first and third quartiles being 62 Bq/m3 and 152 Bq/m3, respectively. The lognormal parameters are the following: geometric mean = 97 Bq/m3, geometric standard deviation = 1.89. A short comparison with the part 1 results of of the indoor radon concentration in 124 schools is reported. Moreover, a spatial estimate of the radon concentration in investigated schools is also reported.