The data presented were developed from machine readable data files provided by the U.S. Bureau of Labor Statistics (BLS) Quarterly Census of Employment and Wages (QCEW) program. The source data files were produced by BLS from information transmitted to BLS by Ohio as part of the QCEW program. The summary data are for Private Ownership records only. The BLS QCEW Home Page contains detailed information on concepts and definitions used in the QCEW program. BLS standards to protect respondent confidentiality sometimes preclude reporting QCEW data where a single firm dominates an area or industry. Larger sub-state areas, such as economic development regions, may trigger confidentiality flags due to the rollup of confidential county data. Further, employer coding assignment changes in the North American Industry Classification System (NAICS) taxonomy may preclude the posting of certain QCEW data, because of confidentiality requirements. In rare cases, abrupt and large employment changes may simply reflect changes in the employer industry classification.