preliminary reapportionment and redistricting plan in different
geographic regions throughout this Commonwealth.
In addition to the requirements of section 16, the following
shall apply:
(1) Senatorial districts shall be drawn with the fewest
number of divisions to counties, municipalities and wards within
the maximum population deviation permissible. A county may not
contain more senatorial districts than the number required by
the population plus one. The commission shall provide a written
explanation for each division.
(2) Representative districts shall be drawn with the fewest
number of divisions to counties, municipalities and wards within
the maximum population deviation permissible. A county may not
contain more representative districts than the number required
by the population plus two. The commission shall provide a
written explanation for each division.
(3) Congressional districts shall each have a population
within the maximum population deviation permissible and shall be
composed of compact and contiguous territory and, unless
absolutely necessary, no county, city, incorporated town,
borough, township or ward shall be divided in forming
congressional districts. The commission shall provide a written
explanation for each division.
(4) The boundaries of each district shall be a single non-
intersecting continuous line.
(5) In establishing districts, the commission shall not
consider the following data:
(i) Addresses of any individual.
(ii) Political affiliation of registered voters.
(iii) Previous election results, unless required by Federal
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