Summary of Findings In 1992, 155.9 thousand persons were employed in Oklahoma's manufacturing establishments. This figure represented an increase of 3 percent from the 1987 figure of 151.2 thousand workers. The total value added by manufacture for the State amounted to $13.7 billion in 1992. This figure, along with all dollar figures in this report, are at prices current for the year specified and, therefore, are unadjusted for changes in price levels. Consequently, when making comparisons to prior years, users should take into consideration the inflation that has occurred. In the State, the leading industry groups ranked by employment were industrial machinery and equipment, fabricated metal products, transportation equipment, and food and kindred products. They accounted for approximately 48 percent of the State's 1992 employment. These same industry groups were the leaders in 1987 when they accounted for approximately 46 percent of the State's employment. The leading counties in the State ranked by employment were Tulsa, Oklahoma, Muskogee, and Creek. They accounted for approximately 57 percent of the State's 1992 manufacturing employment. This represents a shift from 1987 when Oklahoma, Tulsa, Muskogee, and Comanche accounted for approximately 63 percent of the State's employment. Single-establishment companies with up to 20 employees (cutoff varied by industry) were excluded from the mail portion of the census. The data for these establishments (and a small number of larger establishments whose reports were not received at the time the data were tabulated) were obtained from administrative records of other agencies or developed from industry averages. For this State, these establishments accounted for 5 percent of the total value of shipments.