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[8] K-23 was already shown on the Oklahoma highway map connecting to Oklahoma's SH-23 as early as the 1957 edition. [ 9 ] Similarly, the Texas Highway Commission ordered its State Highway 23 signed on January 25, 1959, alongside existing FM 1265.
The state of Oklahoma is served by the following area codes: 405/572: Central Oklahoma including Oklahoma City (original area code created in 1947; 572 added as overlay on April 24, 2021 [1] [2] [3] 580: Western and southern Oklahoma (split from 405 in 1997) 539/918: Northeastern Oklahoma including Tulsa (918 created in 1953 as split from 405 ...
The name faded from shortly after the time the Michigan State Highway Department (MSHD) [a] assigned the first highway numbers in the state. [20] The first state highways along the US 23 corridor were numbered M-65 from the Ohio line north to the Flint area and M-10 from Flint north to Mackinaw City by July 1, 1919.
The north–south highways range from the low 20s into the 40s. There are also three three-digit highways numbered in the 100s and one in the 200s as branches of related two-digit highways. [8] In Michigan, the US Highway System covers about 2,300 miles (3,701 km) of mainline highways and another 160 miles (257 km) of special routes. [3]
The majority of the numbered highways within Oklahoma are maintained by the Oklahoma Department of Transportation (ODOT). The only exceptions are sections of Interstate 44 (I-44) and U.S. Highway 412 (US 412), which run along turnpikes maintained by the Oklahoma Turnpike Authority (OTA).
Map of U.S. Highway 23 in Michigan: Date: 5 March 2016: Source: National Atlas (land, water, boundaries) Natural Earth Data (parks, city points) US Census Bureau (urban areas, local roads) National Highway Planning Network (major roads) Author: Fredddie: SVG development
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Michigan's numbering plan expanded from three area codes in 1947 to twelve: 1947: Area codes 313, 517 and 616 are three of the original 86 area codes in the North American Numbering Plan. 1961: Area code 906 was created in the first split of 616. 1993: Area code 810 was created in the first split of 313. 1997: Area code 734 was created in the ...