Missouri Revised Statutes Title IX. Suffrage and Elections § 115.113. Precincts, how established--new political subdivisions, duty to identify voters of

1. The basic election district shall be the precinct. In each jurisdiction, precinct boundaries shall be established by the election authority. Every effort shall be made by the election authority to establish precinct lines which do not cross political subdivision or special district boundaries. Upon mail notification of each voter affected by the change, or publication of the new boundaries in a newspaper of general circulation in its jurisdiction, the election authority may change precinct boundaries from time to time as convenience may require.

2. When a political subdivision is formed, the political subdivision shall assist the election authority in determining the identity of all registered voters residing in each precinct eligible to vote in elections affecting the district.