Article XIX, Section 2 | Requirements for drawing congressional districts
(A)(1) Each congressional district shall be entitled to a single representative in the United States house of representatives in each congress.
(2) The whole population of the state, as determined by the federal decennial census or, if the federal decennial census is unavailable, another basis as directed by the general assembly, shall be divided by the number of congressional districts apportioned to the state pursuant to Section 2 of Article I of the Constitution of the United States, and the quotient shall be the congressional ratio of representation for the next ten years.
(3) Notwithstanding the fact that boundaries of counties, municipal corporations, and townships within a district may be changed, district boundaries shall be created by using the data from the most recent federal decennial census or from the basis directed by the general assembly, as applicable.
(B) A congressional district plan shall comply with all of the following requirements:
(1) The plan shall comply with all applicable provisions of the constitutions of Ohio and the United States and of federal law, including federal laws protecting racial minority voting rights.
(2) Every congressional district shall be compact.
(3) Every congressional district shall be composed of contiguous territory, and the boundary of each district shall be a single nonintersecting continuous line.
(4) Except as otherwise required by federal law, in a county that contains a population that exceeds the congressional ratio of representation, the authority drawing the districts shall take the first of the following actions that applies to that county:
(a) If a municipal corporation or township located in that county contains a population that exceeds the congressional ratio of representation, the authority shall attempt to include a significant portion of that municipal corporation or township in a single district and may include in that district other municipal corporations or townships that are located in that county and whose residents have similar interests as the residents of the municipal corporation or township that contains a population that exceeds the congressional ratio of representation. In determining whether the population of a municipal corporation or township exceeds the congressional ratio of representation for the purpose of this division, if the territory of that municipal corporation or township completely surrounds the territory of another municipal corporation or township, the territory of the surrounded municipal corporation or township shall be considered part of the territory of the surrounding municipal corporation or township.
(b) If one municipal corporation or township in that county contains a population of not less than one hundred thousand and not more than the congressional ratio of representation, that municipal corporation or township shall not be split. If that county contains two or more such municipal corporations or townships, only the most populous of those municipal corporations or townships shall not be split.
(5) Of the eighty-eight counties in this state, sixty-five counties shall be contained entirely within a district, eighteen counties may be split not more than once, and five counties may be split not more than twice. The authority drawing the districts may determine which counties may be split.
(6) If a congressional district includes only part of the territory of a particular county, the part of that congressional district that lies in that particular county shall be contiguous within the boundaries of the county.
(7) No two congressional districts shall share portions of the territory of more than one county, except for a county whose population exceeds four hundred thousand.
(8) The authority drawing the districts shall attempt to include at least one whole county in each congressional district. This division does not apply to a congressional district that is contained entirely within one county or that cannot be drawn in that manner while complying with federal law.
(C)(1) Except as otherwise provided in division (C)(2) of this section, for purposes of this article, a county, municipal corporation, or township is considered to be split if, based on the census data used for the purpose of redistricting, any contiguous portion of its territory is not contained entirely within one district.
(2) If a municipal corporation or township has territory in more than one county, the contiguous portion of that municipal corporation or township that lies in each county shall be considered to be a separate municipal corporation or township for purposes of this section.