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Ohio State Route numbering schema

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SkyPesos:
Quoting the Ohio portion from NE2's thread here:

--- Quote from: NE2 on October 10, 2013, 11:56:30 PM ---Ohio created a state highway department in 1911, and in December 1912 it laid out a network of numbered "inter-county highways". The legislature designated certain of these as "main market routes" in 1913. The inter-county highways (or at least some of the major ones) were signed in 1920, in what Popular Mechanics (May 1920) calls "an unusual manner" (but was really no different from other states). The main market routes do not seem to have been marked.

The inter-county highways were numbered fairly systematically. 1-30 were all over the place with some weak clustering (perhaps these roads were special somehow, such as already being improved?), but 31- were numbered by county. Essentially, a county was chosen, and all remaining roads in that county not yet numbered received the next available numbers. First were the counties containing major cities: in order, Cleveland, Cincinnati, Columbus, Toledo, Dayton, Canton, Youngstown, Akron, St. Clairsville, Marion; which brought the number to 118. Then 119-186 were assigned to the remaining A and B counties in alphabetical order. But the guy laying out the numbers must have gotten bored with looking for the next county, as he then moved to clustering (the first bit was a mix of alphabetical and clustering, going Champaign-Clark-Crawford-Darke-Hancock-Hardin-Logan) with very few exceptions, most notably repetitions of Belmont County (295), Stark County (368-369), and Van Wert County (434-435). The last four numbers, 441 to 444, were assigned randomly, presumably to roads that were added late in planning.

In 1922 or 1923 almost the whole system was renumbered, although the shield shape remained the same. Except for the probably coincidental retention of 91, only 1, 2, 4, 7, 15, and 18 kept their old numbers at least partially. The first ten routes also had name plates above the shields:
1 National Road
2 Chicago-Buffalo Road
3 C.C.C. Highway
4 Scioto Trail
5 Lincoln Highway
6 Dixie Highway
7 Ohio River Road
8 Cleveland-Marietta Road
9 Wayne Highway?
10 Harding Highway
11 was also cross-state, but then clustering began: 12-18 near Cleveland, 19-22 near Columbus, 23 through Toledo, 24-28 near Cincinnati, and 29 to 42 or so as the rest of the first pass. The second pass went until 79 and the third to 161, then 162 and 163 were rather randomly placed, 164 to 224 formed a final pass, and 225 to 232 were other minor connections that had perhaps been forgotten. There was one meaningful exception: 104 was an alternate to 4 between Columbus and Portsmouth. 102 was similarly an alternate to 2 bypassing Toledo, but fit the clustering.

Maps and logs:
https://www.aaroads.com/forum/index.php?topic=5112
http://web.archive.org/web/20081218121105/http://pages.prodigy.net/john.simpson/highways/ohhwys.html

--- End quote ---
I didn't know that the first 10 original state routes had names attached to it. Well, I know about OH 2, 3 and 7, which still exist in large pieces today. OH 4 is also intriguing, based on what I got from the timeline on Wikipedia. It did used to follow the Scioto River, then from Columbus to Sandusky northward. It still have the Sandusky-Marion route today, though south of there, looks nothing like the Scioto Trail route because of US 23. A lot of those original numbers also got eaten up by US routes, so they get reused on less important routes (*cough* current OH 5)

--- Quote ---1912 Route ran from Sandusky to Columbus
1924 Route extended south from Columbus on former SH 5, following current US 23 alignment from Portsmouth to Waldo, and current SR 423 from Waldo to Marion.[6]
1926 Alignment from Portsmouth to Marion certified as US 23; SR 4 realigned south of Marion to its current southern terminus in Cincinnati, replacing the former SR 6 from Cincinnati to Middletown, the former SR 52 from Middletown to 3 miles (4.8 km) south of Milford Center, and the former SR 38 from Marysville to Marion.[6]

--- End quote ---
As for the rest of the routes, it's clearly clustered, and it looks like as you said, it's done in multiple rounds. One of the most evident ranges is the 122-133 range in southwest Ohio.

frankenroad:

--- Quote from: SkyPesos on June 23, 2021, 07:29:11 PM ---
As for the rest of the routes, it's clearly clustered, and it looks like as you said, it's done in multiple rounds. One of the most evident ranges is the 122-133 range in southwest Ohio.

--- End quote ---

Another notable cluster in SW Ohio is the routes in the range 741-749, although a couple routes in that range are NOT in SW Ohio, six of the 74x series are located in the four southwesternmost counties (Hamilton, Clermont, Warren, & Butler).

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