Here are the top 50 employers in Butler County, based on number of employees, in the fourth quarter of 2015, according to the state Department of Labor and Industry and the Center for Workforce Information and Analysis.

---- 1. Federal government

---- 2. Westinghouse Electric Co.

---- 3. Butler Healthcare providers

---- 4. AK Steel Corp.

---- 5. Wal-Mart Associates

---- 6. Butler School District

---- 7. Seneca Valley School District

---- 8. State System of Higher Education, Slippery Rock University

---- 9. Butler County Community College

---- 10. Butler County government

---- 11. Oberg Industries

---- 12. NextTier Concepts

---- 13. Concordia Lutheran Health and Human Care

---- 14. Alcoa Commercial Windows

---- 15. Penn United Technologies

---- 16. State government

---- 17. Armstrong Utilities

---- 18. Mine Safety Appliances

---- 19. II-VI Inc.

---- 20. Aesynt Inc.

---- 21. Aetna Life Insurance

---- 22. Giant Eagle

---- 23. Glade Run Lutheran Services

---- 24. Mars School District

---- 25. Manheim Remarketing

---- 26. Butler YMCA

---- 27. Celtic Healthcare of Westmoreland

---- 28. Pittsburgh Logistics Systems

---- 29. Rue 21

---- 30. Passavant Retirement and Health Center

---- 31. Sheetz

---- 32. Butler Medical Providers

---- 33. United Parcel Service

---- 34. Dick’s Sporting Goods

---- 35. Lowe’s Home Centers

---- 36. Slippery Rock School District

---- 37. IDL Worldwide

---- 38. Costco Wholesale Corp.

---- 39. South Butler County School District

---- 40. W.L. Roenigk

---- 41. MSA Worldwide

---- 42. Sherwood Oaks

---- 43. Kohl’s Department Stores

---- 44. Hunter Truck Sales & Service

---- 45. Sunnyview Nursing & Rehabilitation Center

---- 46. Home Depot USA

---- 47. Target Corp.

---- 48. Sysco Pittsburgh

---- 49. Adams Manufacturing

---- 50. St. John Specialty Care Center