U.S. job openings fell by 4 percent month-over-month December, but year-over-year job openings rose 40.9 percent, according to Simply Hired’s January 2013 Employment Outlook released today. Agriculture and manufacturing roles experienced the largest amounts of growth month-over-month, while healthcare continued to count the most available job openings.

Job openings increased in seven out of 18 industries in December, according to Simply Hired, a search engine for online job ads. Agriculture at 32.8 percent and manufacturing at 14.3 percent posted the largest gains, while media reported the largest decrease during the month, falling 11.6 percent.

Here are the companies with the most job openings listed on Simply Hired by market:

• Atlanta: Northside Hospital
• Boston: Genesis Healthcare System
• Charlotte, N.C.: Carolinas Healthcare System
• Chicago: Advocate Health Care System
• Cleveland and Akron, Ohio: Cleveland Clinic Foundation
• Dallas and Fort Worth, Texas: Texas Health Resources
• Denver: Centura Health
• Detroit: General Motors
• Houston: Memorial Hermann
• Los Angeles: Deloitte
• Miami and Fort Lauderdale, Fla.: Miami Dade College
• Minneapolis and St. Paul: Life Time Fitness
• New York: Deloitte
• Orlando, Fla.: Florida Hospital
• Philadelphia: Bayada Home Health Care
• Phoenix: Yuma Regional Medical Center
• Pittsburgh, Penn.: BNY Mellon
• Portland, Ore.: Intel
• Raleigh and Durham, N.C.: Duke Nursing
• Sacramento, Calif.: Sutter Health
• San Francisco Bay Area: Google
• Seattle and Tacoma, Wash.: Amazon
• St. Louis, Mo.: Washington University in St. Louis
• Tampa and St. Petersburg, Fla.: BayCare Health System
• Washington, D.C.: General Dynamics