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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 city

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

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:


The default aerial imagery layers in iD and Potlatch are of high resolution but may be up to six years old, so check the vintage of an OSM feature before remapping it based on aerial imagery.

As of 2018, DigitalGlobe Standard and Mapbox imagery are the most up-to-date and highest-resolution imagery layers available in urban and suburban parts of Ohio, while Bing and DigitalGlobe are generally more up-to-date in rural areas. 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.

The Ohio Statewide Imagery Program has published high-quality orthoimagery for the state: the 6-inch imagery is a few years old but still higher-resolution than DigitalGlobe and Mapbox in rural areas and small towns. Meanwhile, 3-inch orthoimagery from early 2018 is available in several counties. The 3-inch imagery is newer and higher in resolution than both DigitalGlobe and Mapbox, but no Web service exists for it. Instead, to use this 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 [1] or JOSM (after installing ImportImagePlugin). For iD or Potlatch, upload the GeoTIFF to a site like Mapbox Studio or MapWarper's WhooMS.

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.


Active mapping communities have sprung up in some of Ohio's larger cities. 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!


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!)

  • Bored – Mostly Akron, occasionally rural areas
  • jwolter – Mostly Cleveland Southwest
  • Mike_Sherman – Mostly North Eastern Ohio
  • Minh Nguyễn – Greater Cincinnati, Greater Dayton, occasionally elsewhere in the west and south
  • Nate_Wessel – Cincinnati and Northern Kentucky
  • S_H – Mostly Columbus, Ohio
  • skorasaurusCleveland and Cuyahoga County
  • Stefan Bethke – Mostly between Zanesville and Marietta
  • Vid the Kid – Mostly Central Ohio
  • Johnny Mapperseed - Northern Ohio, especially near Lake Erie and Northwest Ohio.
  • Doktorpixel14 - Northern Central Ohio, espacially Columbus, as well as Morrow and Richland County (not local)

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 #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. [2] 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.

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. [3] 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. [4][5][6][7]


Geographical disputes

OSM in the wild

To do

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

  • Clean up rural TIGER-imported roads. Thousands of private drives are tagged as residential streets. Many others simply don't exist, which is usually clear from the aerial imagery. Many were also clearly digitized at a small scale and need closer alignment with the large scale imagery. (Completed for Tuscarawas and Carroll Counties).
  • Add landuses pretty much everywhere.
  • Verify imported airport points.
  • Complete Cuyahoga Valley National Park and start mapping Wayne National Forest.
  • Sift through Mapillary street-level images for amenities and landmarks to map. Logo signs can help us figure out which gas station/restaurant is which.
  • Add township lines.
  • Merge city limits with county lines.
  • "Weld" roads and rivers to county lines – but only where they actually run along county lines. (In particular, don’t weld anything to the Ohio River, because the law is based on its old northern bank.)
  • Complete U.S. Bicycle Route 50 in Dayton.
  • Identify more county and township route networks and add these routes to relations.
  • Complete route relations for Appalachian Development Highways.
  • Create route relations for USDA forest routes.
  • Map more downtowns in glorious 3D. (See Cincinnati for an example.)

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.

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
SEN Seneca
SCI Scioto
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

United States
States in the United States Alabama · Alaska · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · Florida · Georgia · Hawaii · Idaho · Illinois · Indiana · Iowa · Kansas · Kentucky · Louisiana · Maine · Maryland · Massachusetts · Michigan · Minnesota · Mississippi · Missouri · Montana · Nebraska · Nevada · New Hampshire · New Jersey · New Mexico · New York · North Carolina · North Dakota · Ohio · Oklahoma · Oregon · Pennsylvania · Rhode Island · South Carolina · South Dakota · Tennessee · Texas · Utah · Vermont · Virginia · Washington · West Virginia · Wisconsin · Wyoming Washington, District of Columbia