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Wiki­Project Ohio

Ohio, United States

latitude: 40.25, longitude: -83
Browse map of Ohio 40°15′00.00″ N, 83°00′00.00″ W
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External links:
Use this template for your locality

Ohio is a state in the United States at latitude 40°15′00.00″ North, longitude 83°00′00.00″ West.

Flag of United States Part of United States mapping project.

Getting started

See a comprehensive rundown of common OSM tags and Ohio-specific tagging recommendations and examples. Some city-level mapping portals:

We use relations to represent complex features like routes and jurisdictional boundaries. There's a wealth of information at these two pages:


Aerial Imagery

A number of aerial and satellite imagery layers are available in iD, Potlatch, and JOSM. The default layer in iD and Potlatch is Bing Aerial Imagery, which you should generally avoid due to its age, except in some urban areas. Check the vintage of an OSM feature before remapping it based on older aerial imagery – a lot can change in a year or two. To keep other mappers from "reviving" a demolished building, change its building=* tag to demolished:building=* instead of deleting it.

When mapping a tall building or a road in a hilly area, choose a well-aligned, high-resolution layer to draw the building footprint with minimal skew or offset, then switch to the most current layer to look for any additions or demolitions that may have taken place recently. When mapping in a wooded area, choose a leaf-off layer so you can easily see through tree cover. When mapping bodies of water, choose a leaf-on layer, which is more likely to show the low-water mark.

Imagery layer comparison as of October 2019
Imagery layer Resolution Age in years Alignment Tree leaves Coverage
Bing Aerial Imagery Medium 4–11 Depends On Statewide
Esri Low 8–14 Poor On Statewide
Esri Clarity Beta Medium 12 Poor On Statewide
Mapbox Satellite (metro) High 7 Good On Akron, Canton, Cincinnati, Cleveland, Columbus, Dayton, Lima, Lorain, Newark, Sandusky, Toledo, Youngstown and vicinity
Mapbox Satellite (rural) Medium 4 Depends On Outside metro areas
Maxar Premium Medium 4–6 Depends On Statewide
OSIP 1ft Most Current Available 1 ft 10–13 Good Off Statewide [1]
OSIP 6in Most Current Available 6 in 5–7 Good Off 40 counties, mostly northern and western counties [2]
OSIP 3in 3 in 6–7 Good Off Butler, Delaware, Fairfield, Gallia, Warren counties [3]; ask for details in #local-ohio in OSMUS Slack
CAGIS 1 ft 4 Good Off Hamilton, Butler, Warren counties [4]; ask for details in #local-ohio in OSMUS Slack

This table of corn mazes gives a good idea of the vintage of each aerial imagery layer by county. The Bing aerial imagery analyzer is another tool for determining Bing imagery vintage, although these days it only reports a very broad date range. This Mapbox layer indicates the vintage of NAIP in a given area.

Mapillary covers major highways in much of the state, major roads in Columbus and the northeast, and every nook and cranny in north-central Ohio. OpenStreetCam has more recent coverage along the Interstates and has similar coverage of north-central Ohio.

A number of datasets are available for importing.

Proxy for Geo-restricted Aerial Imagery

The Ohio Statewide Imagery Program (OSIP) uses a server that is known to block HTTPS connections from outside the United States. However, it is possible to proxy WMS requests for mapping purposes. [5] OSIP also publishes 3-inch orthoimagery from 2018 and 2019 for several counties. The 3-inch imagery is newer and higher in resolution than both Maxar and Mapbox, but no public Web service exists for it. AdamP hosts some of this imagery for local mappers; ask for details in the #local-ohio channel of OSMUS Slack. To use other OSIP imagery in an editor:

  1. Download an individual tile and unzip the file.
  2. Open the GeoTIFF file in an image editor, such as the GIMP, and replace the grayscale channel, which most programs incorrectly interpret as an alpha channel, with a white fill.
  3. Load the GeoTIFF into Merkaartor [6] or JOSM (after installing ImportImagePlugin). For iD or Potlatch, upload the GeoTIFF to a site like Mapbox Studio or MapWarper's WhooMS.

Alternatively, you can use a proxy server operated by OpenStreetMap U.S.: Go to https://github.com/osmlab/editor-layer-index/ or https://josm.openstreetmap.de/wiki/Maps/USA%20Country and find the URL of the image layer you want to view overseas. Copy the URL up to and including the MapServer or ImageServer. Paste it into the ArcGIS Server Proxy’s “ArcGIS Server URL” field, then hit “Update Tile Layer” to see a preview and a proxy URL template that you can use in either iD or JOSM.


Several Ohio universities and libraries have pages that are excellent starting points to discover data that can be added.

List of Landing Pages as of September 2019
Name Description Copyright
OSUL Map Collections
Cincinnati Library Sanborn Fire Insurance Maps None
Columbus Metropolitan Library Map Collection
University of Cincinnati Research Labs @ GMP Links to national, county, and city GIS page. Varies
University of Cincinnati Planning & Urban Studies Research Guide Great list of historical imagery and maps for cities and topics. Varies
Ohio History Connection Historic Atlases PDFs of historical surveys sorted by county. None


Known Collection of Pictures as of September 2019
Name Type Coverage Copyright
Ohio Redevelopment Projects Street level and Inside Buildings State Wide CC BY
Wikimedia Commons Various State Wide Varies

Nationwide Data

Statewide Data

Streetlevel Photos

  • Mapillary
  • Bing Maps Streetside (Note: Only Streetside can be used to reference data in OSM. Do not use data from other Bing Maps products such as roads or POIs.)

Tips and Tricks


Addresses in Ohio are included in ESRI's United States Addresses dataset. In RapID, enable United States Addresses dataset by ESRI to easily add addresses into OSM. Once the address and building has been added, highlight both the building and the address that it corresponds to, and press C to combine the information.


OpenStreetMap Ohio Meetup

Jonathan Brier aka Wolfgang8741 is hosting a monthly virtual meetup: Next Meeting: 12th June 19:00-20:00 Eastern Time - Join us https://osmvideo.cloud68.co/user/jon-zjn-vpe-msf access with: 206104

(optional) Let others know you are coming by marking attending on the OSMCal event: https://osmcal.org/event/2566/

Chat with us on OSMUS Slack #local-ohio channel to @wolfgang8741.

The virtual meet-up is aimed to building relationships to help with problem solving as a complement to other OSM channels, local meetups, and provide a space to meet for those who are not near a city or with a dense area of mappers to build a community. Topics may include: what is your reason for mapping Ohio, what problems have you run into, what tools do you use, how to connect with local organizations, Identifying OSM data needs of Wikipedia content or other OSM data consumer and what can we do to address those with our mapping.

Past meeting notes

Upcoming Meeting Agenda

  • Address Imports Demo
  • Add your topic or idea

Local Groups

Active mapping communities have sprung up in some of Ohio's larger cities. - See if your community group is listed - https://openstreetmap.community/

  • Cleveland area - Mappers in the Cleveland area have organized through Open Cleveland and Open Geo Cleveland. Organizing real-life meetups is a great to way to attract more mappers in your city!
  • Columbus


Main article: :Category:Users in Ohio

If you have questions, these mappers may be able to help you out. (Let everyone know where you like to contribute!)

  • AdamP – Cincinnati metro area.
  • Bored – Mostly Akron, occasionally rural areas
  • Doktorpixel14 - Northern Central Ohio, especially Columbus, as well as Morrow and Richland County (not local)
  • Johnny Mapperseed - Northern Ohio, especially near Lake Erie and Northwest Ohio.
  • jwolter – Mostly Cleveland Southwest
  • Longhorn256 - Western Reserve - Ashtabula and Trumbull Counties
  • Mike_Sherman – Mostly North Eastern Ohio
  • Minh Nguyễn – Greater Cincinnati, Greater Dayton, occasionally elsewhere in the west and south
  • S_H – Mostly Columbus, Ohio
  • skorasaurusCleveland and Cuyahoga County
  • Stefan Bethke – Mostly between Zanesville and Marietta
  • Vid the Kid – Mostly Central Ohio
  • Korgi1 - Mostly Northwest Ohio and sporadically other places
  • Wolfgang8741 - Washington County, Ohio
  • rdelach - Athens County, Ohio

Find non-wiki-using mappers using Who's around me? And be sure to subscribe to the talk-us mailing list, where the broader U.S. mapping community discusses tagging, imports, policy, evangelization, and more. If you have any questions, you can also ask on the #local-ohio channel of the U.S. community's Slack workspace (invite yourself).


OpenStreetMap's coverage of Ohio may have started mid-2006, with an import of TIGER 2005 street data for the Greater Cincinnati Tri-State area in response to a request by Teratornis. [7] If the import did make it to Cincinnati, it was later purged due to widespread quality issues. Aside from that, Ohio was mostly blank, nothing but I-70 west of Columbus, I-75 north of Wapakoneta, the Ohio Turnpike west of Toledo, other Toledo highways, I-76 west of Youngstown, and the City of Berea.

In 2007, Dave Hansen and others imported the same street data that was previously requested (Greene County was imported twice). Yellowbkpk imported county lines from the USGS in 2008, and Chris Lawrence imported TIGER 2007 city limits the following year. USGS GNIS imports provided airfields in 2007 and various other points of interest in 2009. The EPA hazard import was largely deleted except for an area surrounding Cincinnati and Dayton, where the imported points were eventually cleaned up and updated.

Ohioans appear to have begun contributing to the map in 2008 and 2009. With help from out-of-staters, we've cleaned up all kinds of issues, such as outdated streets and overlapping county lines. In particular, NE2 added virtually all state and U.S. routes to route relations and cleaned up many railways throughout the state.

In 2012, students of GeodSciE 607 and Geography 688 at Ohio State made many improvements to the map. Later that year, a tweet comparing OSM's coverage of Bowling Green State to various commercial map services went viral. The global OSM community swarmed in, fully micromapping Bowling Green in a matter of days.

Since 2012, some students of GEO109 at the University of Kentucky have also helped map the Greater Cincinnati area.

In 2017, the Ohio Valley Regional Development Commission (OVRDC) imported sidewalks and crosswalks in their 12-county region. [8] Later that year, Miami University organized a mapathon to help the Humanitarian OSM Team map Puerto Rico following Hurricane Maria. The mapathon received coverage in the Cincinnati and Dayton press. [9][10][11][12]

In 2018 and 2019, Cincinnati-area mappers imported buildings and addresses in Hamilton County.


Geographical disputes

OSM in the wild

To do

Here are some statewide and regional items that need attention. Feel free to add your own:

County abbreviations

We use ODOT's three-letter county abbreviations for various purposes. For most counties, the abbreviation consists of the first three letters of the county's name, but there are exceptions. [13]

Ohio County Abbreviations.png

Three-letter county abbreviations
Code Name
ADA Adams
ALL Allen
ASD Ashland
ATB Ashtabula
ATH Athens
AUG Auglaize
BEL Belmont
BRO Brown
BUT Butler
CAR Carroll
CHP Champaign
CLA Clark
CLE Clermont
CLI Clinton
COL Columbiana
COS Coshocton
CRA Crawford
CUY Cuyahoga
DAR Darke
DEF Defiance
DEL Delaware
ERI Erie
FAI Fairfield
FAY Fayette
FRA Franklin
FUL Fulton
GAL Gallia
GEA Geauga
GRE Greene
GUE Guernsey
HAM Hamilton
HAN Hancock
HAR Hardin
HAS Harrison
HEN Henry
HIG Highland
HOC Hocking
HOL Holmes
HUR Huron
JAC Jackson
JEF Jefferson
KNO Knox
LAK Lake
LAW Lawrence
LIC Licking
LOG Logan
LOR Lorain
LUC Lucas
MAD Madison
MAH Mahoning
MAR Marion
MED Medina
MEG Meigs
MER Mercer
MIA Miami
MOE Monroe
MOT Montgomery
MRG Morgan
MRW Morrow
MUS Muskingum
NOB Noble
OTT Ottawa
PAU Paulding
PER Perry
PIC Pickaway
PIK Pike
POR Portage
PRE Preble
PUT Putnam
RIC Richland
ROS Ross
SAN Sandusky
SCI Scioto
SEN Seneca
SHE Shelby
STA Stark
SUM Summit
TRU Trumbull
TUS Tuscarawas
UNI Union
VAN Van Wert
VIN Vinton
WAR Warren
WAS Washington
WAY Wayne
WIL Williams
WOO Wood
WYA Wyandot

There are also standard township and municipal numbers within each county, but we don't currently use them for anything.

See also