Geographical History

District 7
On 1 September 1915, District 7 was created. It was comprised of the entire state of Ohio, West Virginia, and Michigan (Lower Peninsula).

District 10
On 1 July 1918, District 10 was created. It consisted of the entire state of Ohio.

District 21
On 1 July 1922, Districts 21 and 22 were created in the state of Ohio.

District 21 was made up of the following: that portion north of the southern boundaries of the counties of Mercer, Auglaize, Hardin, Marion, Marion, Morrow , Richland, Ashland, Holmes, Tuscarawas, Stark and Columbiana. District 22 was: tht portion south of the southern boundaries of the counties of Mercer, Auglaize Hardin, Marion, Morrow, Richalnd, Ashland, Homes, Tuscaraws, Stark and Columbiana.

District 157
On 1 July 1937, three districts were created in the state of Ohio: 157, 158, and 159. District 157 was that portion north of the southern boundaries of the counties of Drake, Miami, Champaign, Union, Delaware, Knox and Holmes, and west of the western boundaries of the counties of Cuyahoga, Summit, Stark and Tuscarawas (previously part of District 21).

On 1 July 1940, there were only two districts: 157 and 159. On 1 January 1942, again three districts – 157, 158 and 159 – came into effect.

On 1 July 1943 there were minor adjustments in the three districts.

District 227
On 1 July 1949, three districts were renumbered. #157 became 227, #158 became 227, #158 became 229, and #159 became 231, and two more districts were created: #230 (1955-56) and #232 (1950-51).

District 660
On 1 July 1957, districts in the state of Ohio were renumbered as follows: #227 became 660, #229 became 665, #231 became 667 and #232 became 669.

On 1 July 1966, there were minor adjustments between Districts 660 and 663.

On 1 July 1969, there were minor adjustments between Districts 660 and 663.

District 6600
On 1 July 1991, three-digit numbers of all the districts in the world were switched to four-digit numbers by adding zero to each district.

On 1 July 1995, District 6600 became part of Zone 28, along with Districts 6290, 6310, 6330, 6360, 6380, 6400, 6540, 6630, 6650, 7090,7280,7300,7330.