There are many State and County level GIS data sources available online. MVRPC has aggregated a list for easy access to some useful data sources.
Statewide services:
Ohio Department of Natural Resources GIS data services: http://www.dnr.state.oh.us/tabid/23171/Default.aspx
Download statewide imagery via the Ohio Statewide Imagery Program (OSIP 2): http://gistest1.oit.ohio.gov/geodatadownload/osip2.aspx
OGRIP GIS data services: http://ogrip.oit.ohio.gov/ProjectsInitiatives/OSIPDataDownloads.aspx
County Data:
Butler County:
Butler County GIS web site: http://maps.butlercountyohio.org/
Clark County:
Clark County Auditor’s Office: http://gis.clarkcountyauditor.org/
GIS data downloads: http://downloads.ddti.net/ClarkOH/
Darke County:
Darke County Auditor’s Office: http://www.darkecountyrealestate.org/
(Click ‘GIS’ in the sidebar to the left)
Email contact: darkecountygis@gmail.com
Greene County:
Greene County GIS: http://www.co.greene.oh.us/index.aspx?nid=249
Miami County:
GIS web site: http://www.co.miami.oh.us/Index.aspx?NID=115
GIS contact email: gis@co.miami.oh.us
Montgomery County:
Montgomery County Auditor’s Office: http://www.mcrealestate.org/Main/Home.aspx
GIS data download web site: http://www.mcauditor.org/downloads/gis_filedownload.cfm
Montgomery County Engineer’s Office, Contours- http://engineer.gomvo.org/apps/Contours/
Montgomery County Engineer’s Office, Land Records-http://engineer.gomvo.org/apps/LandRecords/
Montgomery County Engineer’s Office, Geodetic Control- http://engineer.gomvo.org/apps/GeodeticControl/
Preble County:
Preble County Auditor’s Office: http://www.preblecountyauditor.org/
GIS data downloads: http://downloads.ddti.net/PrebleOH/
Warren County:
Warren County GIS web site: http://www.co.warren.oh.us/warrengis/