(3)(a) Each supervisor of elections shall maintain a suitable map drawn to a scale no smaller than 3 miles to the inch and clearly delineating all major observable features such as roads, streams, and railway lines and showing the current geographical boundaries of each precinct, representative district, and senatorial district, and other type of district in the county subject to the elections process in this code.
(b) The supervisor shall provide to the department data on all precincts in the county associated with the most recent decennial census blocks within each precinct.
(c) The department shall maintain a searchable database that contains the precincts and the corresponding most recent decennial census blocks within the precincts for each county, including a historical file that allows the census blocks to be traced through the prior decade.
(d) The supervisor of elections shall notify the Secretary of State in writing within 10 days after any reorganization of precincts and shall furnish a copy of the map showing the current geographical boundaries and designation of each new precinct. However, if precincts are composed of whole census blocks, the supervisor may furnish, in lieu of a copy of the map, a list, in an electronic format prescribed by the Department of State, associating each census block in the county with its precinct.
(e) Any precinct established or altered under the provisions of this section shall consist of areas bounded on all sides only by census block boundaries from the most recent United States Census. If the census block boundaries split or conflict with another political boundary listed below, the boundary listed below may be used:
1. Governmental unit boundaries reported in the most recent Boundary and Annexation Survey published by the United States Census Bureau;
2. Visible features that are readily distinguishable upon the ground, such as streets, railroads, tracks, streams, and lakes, and that are indicated upon current census maps, official Department of Transportation maps, official municipal maps, official county maps, or a combination of such maps;
3. Boundaries of public parks, public school grounds, or churches; or
4. Boundaries of counties, incorporated municipalities, or other political subdivisions that meet criteria established by the United States Census Bureau for block boundaries.
(4)(a) Within 10 days after there is any change in the division, number, or boundaries of the precincts, or the location of the polling places, the supervisor of elections shall make in writing an accurate description of any new or altered precincts, setting forth the boundary lines and shall identify the location of each new or altered polling place. A copy of the document describing such changes shall be posted at the supervisor’s office.
(b) Any changes in the county precinct data shall be provided to the department within 10 days after a change.
(c) Precinct data shall include all precincts for which precinct-level election results and voting history results are reported.