Ohio Plumbers License

Ohio Construction Industry Licensing Board
http://com.ohio.gov/dico/OCILB.aspx/

Ohio Department of Commerce
http://www.com.state.oh.us/

Ohio Division of Industrial Compliance and Labor
http://www.com.ohio.gov/dico/

USA Plumbing Info
http://www.usaplumbing.info/license/oh/ohio-plumbing-license-requirements

Contractors License Reference Site
http://www.contractors-license.org/oh/oh.htm

Plumbing Heating Cooling Contractors of Ohio
http://www.phccohio.org/