Health insurance provided by employers is the source of medical coverage for most Americans under age 65. The cost of employer-sponsored health insurance varies considerably based on the State where the employer is located and the number of persons covered by the plan. This Statistical Brief presents State variations from the national average of the cost of job-related health insurance and how these costs are shared by employers and their employees. The Brief specifically examines the average premiums and employee contributions for private sector establishments in 2013 in the 10 most populous states based on the 2010 Decennial Census. This analysis is based on the most recent data available from the Insurance Component of the Medical Expenditure Panel Survey (MEPS-IC). Estimates for all other States and the District of Columbia are available on the MEPS Web site (http://www.meps.ahrq.gov). Only those estimates with statistically significant differences from the national average using a multiple comparison procedure of estimates at the 0.05 percent significance level are noted in the text. These estimates are also identified in the tables, with those above the national average noted with two asterisks (**) and those below the national average noted with one asterisk (*).