The job surge in the Bay Area has now reached every urban center in the region, which added nearly 11,000 jobs during March, a state labor report of seaasonally adjusted numbers released Friday showed.

Unadjusted numbers show the Bay Area added 18,800 jobs in March, but the unadjusted employment rates in many counties still increased by an average of 0.2 percent.

Employment levels in the Bay Area are at three-year highs. The last time payroll job totals in the nine-county region topped the current levels was in February 2009, according to this newspaper’s analysis of the state Employment Development Department figures.

To underscore the solid employment upswing in the Bay Area, the South Bay, East Bay, and San Francisco metro region each added thousands of jobs in March.

The South Bay added 2,200 jobs and the East Bay gained 2,000 in March. The numbers were adjusted for seasonal variables.

Employment officials calculate jobs numbers based on the total number of jobs added, called unadjusted totals. Seasonably adjusted numbers take into account typical hiring during any given month.

The San Francisco-San Mateo-Marin region was the region’s employment leader last month, gaining 3,500 jobs. Sonoma County added 2,400 jobs.

What’s more, the pace of hiring has doubled this year.

During the first three months of 2012, Bay Area employers added jobs at an average pace of 12,000 jobs a month. Over the final three months of 2011, employment gains averaged 6,000 a month.

California added 18,200 payroll jobs last month and the statewide jobless rate worsened to 11 percent. In February, California’s jobless rate was 10.9 percent.

The employment improvements in the Bay Area were strong enough that they accounted for more than half the jobs — 58 percent — created in the entire state during March.

“Bay Area employment continues to run well ahead of the rest of the state,” Michael Bernick, a research fellow with the Milken Institute, stated in an e-mailed comment.

Mercury News reporter Jeremy Owens contributed to this report. Contact George Avalos at 925-977-8477. Follow him at twitter.com/george_avalos.