San Diego County added a net of 900 jobs in August, helping to reduce the region’s unemployment rate to 9 percent from July’s revised rate of 9.3 percent. The region’s jobless rate in August 2011 was 10.3 percent, according to the state’s Employment Development Department.

For the same month, California had an adjusted unemployment rate of 10.6 percent, down by a tenth of a point from July. The national jobless rate was an adjusted 8.1 percent, down from 8.3 percent in July.

In San Diego, the reduced rate was driven by job creation in two main areas, each of which showed a gain of more than 1,000 jobs. Retail trade gained 1,300 jobs, while leisure and hospitality increased by 1,200 jobs during the past month.

The sector showing the largest decline was professional and business services, which showed a drop of 3,100 jobs. Administrative and support services made up 2,100 of that number, the EDD report said.

Ironically, this same sector has been the largest job generator over the past 12 months, and contributed 6,300 net new jobs to the total gain through August of 30,300.

That number was 2.5 percent above the total jobs gain in August 2011.

For the year, the region showed net losses in only two of 11 job sectors, led by manufacturing, losing 700 jobs through August, and information, down by 100 jobs.