Cincinnati, Ohio, United States
|latitude: 39.1, longitude: -84.516667|
|Browse map of Cincinnati 39°06′00.00″ N, 84°31′00.00″ W|
|Use this template for your city|
The Tri-State area has pretty good OSM coverage for an American metropolitan area, with extensive building footprints, transit routes, named landuse areas, footpaths and staircases, cul-de-sacs, and the beginnings of 3D building support (example). Virtually all roads imported from TIGER have been redrawn.
That said, there are infinite opportunities for improvement! Greater Cincinnati has seen a lot of activity over the past few years, but Northern Kentucky is quickly improving and we're starting to pay some attention to Southeast Indiana too. We may have a lot of buildings mapped, but hardly any have addresses on them. A great way to start is to zoom all the way into your neighborhood and add as much detail as you can. Even toolsheds are fair game.
Use this comparison table to choose the right aerial imagery layer to use when mapping.
Bing Streetside has extensive omnidirectional street-level imagery of Cincinnati; Butler, Warren, and Kenton counties; and major streets in Hamilton and Campbell counties, but this imagery is from 2012–2014 and should be supplemented with other sources where possible. Mapillary covers the Tri-State's highways, downtown and uptown Cincinnati, and major streets in the Loveland and Milford areas, mostly from 2018 onward. OpenStreetCam also has recent coverage of the Tri-State along the Interstates.
The Cincinnati Department of Public Services also publishes GPS data of their vehicles, which could be used to align aerial imagery.
The Lane Library hosts Ohio Historic Inventory forms for Butler County structures on the National Register of Historic Places. These forms are good sources of information like names, basements, and building materials. Many date to before 1989 and lack copyright notices, which mean they're in the public domain.
Yellow island lights (or "turtle lamps") found at many pedestrian traffic islands (or "pork chop islands"):
highway=street_lamp support=pole lamp_mount=straight_mast light:method=electric light:colour=yellow light:count=1 light:lit=dusk-dawn light:shape=cylindrical light:tilt=-90 light_model=turtle lamp_type=electric
In 2017, Miami University organized a mapping party to help the Humanitarian OSM Team map Puerto Rico following Hurricane Maria.  However, there hasn't been a meetup or mapping party focused on the Tri-State area – you're welcome to start one.
Find non-wiki-using mappers using Who's around me? 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-indiana channels of the U.S. community's Slack workspace (invite yourself).
Please introduce your friends to OpenStreetMap! Reach out to enthusiast communities in orienteering, urban planning, and open source. Show a local trivia buff the old_name=* and name:etymology=* tags; show a road fan the route networks page.
OSM in the wild
- The Cincinnati Bike Map, published in September of 2014, is entirely based on OSM data. 9,000 copies of the map were printed for free local distribution. It is available online and by mail on request.
- Bus Detective, a local real-time transit app, locates stops on the Humanitarian OSM Team (HOT) basemap.
- Red Bike's Android and iOS applications plot station locations against an OSM-based basemap and display OSM-based routes to stations, powered by Mapbox.
- The Butler County RTA plots bus routes against the standard OSM basemap (example).
- OKI's Traffic Counts Web application visualizes traffic count data atop an OSM-powered Mapbox/Esri map.
Every news media outlet in Cincinnati plots its online Doppler radar against an OSM-based basemap by Mapbox:
- Great Parks of Hamilton County's online park maps are plotted against the OSM-based Mapbox Streets style. 
- The Public Library of Cincinnati and Hamilton County plots geotagged collection items against the standard OSM basemap. 
- Go Solar Cincy, a project of OKI, uses building footprint data from OSM to supplement those from institutional data sources in their web map.
- Cincy 311 plots 311 calls against the HOT basemap.
- Cincinnati St. Vincent de Paul plots its locations against the standard OSM basemap.
- The official Blink Cincinnati 2019 application for Android and iOS plots light installations atop the OSM-based Mapbox Dark style and provides walking directions from the OSM-based Mapbox Directions API.
- Clermont County Online Mapping, Clermont County's GIS portal, displays the openstreetmap-carto renderer as a basemap by default.
- 3CDC and the Port Authority of Greater Cincinnati plot their real estate projects against the OSM-based Mapbox Light style.
- Walking Cincinnati, a travel guide by Danny Korman and Katie Meyer, uses OSM for its maps.
- Main article: Cincinnati, Ohio/Statistics
Acknowledging that everything can always be better, this is a list of things which are, for now, really quite accurate and thoroughly identified. Please add more things to this list if you've made a point of seeing that some particular thing in Greater Cincinnati has been mapped to the fullest; it's good to know what our strengths are!
- Building footprints in urban areas
- Major building footprints in suburban and rural areas
- Cul-de-sacs (aka turning circles)
- Marked pedestrian crossings
- Coffee shops and bike shops for now, though such places are always changing
- Schools and universities 
- Street geometry and names have generally been vetted pretty thoroughly
- Cincinnati neighborhood retail areas
- Park boundaries and sports pitches in Cincinnati proper
- High-voltage power lines and towers
- Alleys are increasingly well-tagged. Almost all alleys are identified (service=alley), though many can still use names and other information.
- Cycleways (bike paths, bike lanes and trails)
- lanes=* on primary, secondary and tertiary streets
- Golf courses (although details like golf cart paths, holes, and fairways are missing on many golf courses)
- The Cincinnati Southern Railway (owned by the City of Cincinnati) is completely mapped to Chattanooga, although sidings, spurs, and level crossings are lacking in many places.
- Turn lanes in southwestern Ohio and southeastern Indiana, amounting to 2.2% of turn lane miles in the U.S. as of January 2019
Plenty of room for improvement
- Add buildings beyond Hamilton County.
- Clean up buildings in Cincinnati that were drawn based on grainy Yahoo! aerial imagery.
- Retag demolished buildings with demolished:building=*, especially in Hamilton County.
- Classifying building=* tags, from a simple building=yes to something more informative. (apartments, retail, garage, house, church, etc.) 
- Add tree cover in suburban and rural areas.
- Add more 3D building data, particularly building heights.
- Add more City of Cincinnati neighborhood boundaries as admin_level=10 relations, indicating any boundary disputes.
- Map and name residential subdivisions and shopping centers (they can get prominent labels, based on zoom level and area).
- Add businesses pretty much everywhere.
- Upgrade businesses to have brand tags suggested by iD. (Make sure to preserve more specific names and curly apostrophes if present.)
- Make sense of neighborhood names within Covington.
- Add street details like sidewalks, lane counts, speed limits, widths, lighting, and speed bumps
- Add public transit routes and stops, which can be found in public GTFS feed data.
- Add access=* tags to service roads on private property.
- The urban NKY cities need ground-verification of the directionality of their streets. There are almost certainly more one-way streets than are identified yet. Tag known two-ways as oneway=no.
- Indicate signalization at intersections, whether stop signs or traffic signals.
- Replace exit_to=* with destination=*, destination:ref=*, and destination:street=* in on I-71/75 south of I-275.
- Replace note:lanes=* with lanes:forward=* and lanes:backward=*.
- Tag turn lanes in Northern Kentucky with turn:lanes=*, turn:lanes:forward=*, and turn:lanes:backward=*.
- Add maxspeed:advisory=* to tight curves and highway ramps.
- Remove maxspeed=* tags from highway ramps.  (There are no legal speed limits on ramps, only advisory speed limits.)
- Clarify easily mispronounced street names, particularly those of German origin, with name:pronunciation=* and destination:pronunciation=*.
- Add retreat=yes to any Safe Place you come across (mostly fire stations, community centers, churches, and chain retailers).
- Identify tornado sirens using OSIP, Mapbox, and Bing Streetside imagery.
Things to keep tabs on
- Keep on top of new bike lanes as they're built by the City of Cincinnati.
- Weed out outdated church, school, and post office POIs imported from GNIS. Many are marked "(historical)" in the name=* tag.
- Mine Mapillary street-level images for amenities and landmarks.