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  2. List of National Historic Landmarks in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Historic...

    This is a list of National Historic Landmarks in Ohio and other landmarks of equivalent landmark status in the state. The United States' National Historic Landmark (NHL) program is operated under the auspices of the National Park Service, and recognizes structures, districts, objects, and similar resources according to a list of criteria of national significance. [6]

  3. List of counties in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_counties_in_Ohio

    The population of Ohio was 11,785,935 at that time, a decrease of 0.1% from 2020. The average population of Ohio's counties was 133,931; Franklin County was the most populous (1,326,063) and Vinton County was the least (12,474). The average land area is 464 sq mi (1,200 km 2).

  4. List of Ohio area codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Ohio_area_codes

    In 2015, area code 740 was overlaid with 220, relieving its rapid depletion. In 2016, area code 614 was overlaid with 380 in the Columbus/Central Ohio area for the same reason. In 2020, 326 was added as an all services overlay for 937. Area code 283 was added as an overlay for 513 on April 28, 2023. [ 2][ 3] Area code 436 went into service on ...

  5. National Register of Historic Places listings in Ohio

    en.wikipedia.org/wiki/National_Register_of...

    The locations of National Register properties and districts (at least for all showing latitude and longitude coordinates below), may be seen in an online map by clicking on "Map of all coordinates". [a] This National Park Service list is complete through NPS recent listings posted August 9, 2024. [1]

  6. List of townships in Ohio - Wikipedia

    en.wikipedia.org/wiki/List_of_townships_in_Ohio

    The 2018-2019 Ohio Municipal, Township and School Board Roster (maintained by the Ohio Secretary of State) lists 1,308 townships, with a 2010 population totaling 5,623,956. [1] When paper townships are excluded, but name variants counted separately (e.g. "Brush Creek" versus "Brushcreek", "Vermilion" versus "Vermillion"), there are 618 ...

  7. Area codes 330 and 234 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_330_and_234

    Area code 330 was established on March 9, 1996 in an area code split of area code 216. It was Ohio's first new area code since the creation of NANP in 1947. Area code 234, originally planned as the relief code for the Jacksonville, Florida area, was established on October 30, 2000, to form an overlay plan for the service area. Ten-digit dialing ...

  8. Module:Location map/data/USA Ohio/doc - Wikipedia

    en.wikipedia.org/wiki/Module:Location_map/data/...

    Module:Location map/data/USA Ohio is a location map definition used to overlay markers and labels on an equirectangular projection map of Ohio. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.

  9. Category:National Historic Landmarks in Ohio - Wikipedia

    en.wikipedia.org/wiki/Category:National_Historic...

    C. Captain Edward V. Rickenbacker House. Carew Tower. Charles F. Kettering House. Charles Young Buffalo Soldiers National Monument. Cincinnati Music Hall. Cincinnati Observatory. Cincinnati Union Terminal. Cincinnati Zoo Historic Structures.