To be involved, you need to know what districts you live in for US House of Representatives (which with the US Senate comprises the US Congress and the PA General Assembly (= PA Senate and PA House). For which precinct you should vote in (find that here).
Find maps of current electoral districts for US Congress (as of 2012), PA Senate and House (as of Dec. 2014), and Chesco school districts by clicking here for the County site.
For a map of each PA House and Senate district with the list of municipalities and precincts in each , see here.
Download a map of Chesco with all its PA Senate districts here: PA State Senate districts 2014-
Download a map of Chesco with all its PA House districts here: Chesco PA House districts 2014
For convenient reference and printing, download a pdf of municipalities and precincts in each district (2 pages, no maps) of Chesco districts here: PA districts Chesco 2015–
Download an Excel list of each Chesco precinct with its Democratic zone, US House district, PA senate district, and PA House district here: Chesco Zones and Districts 2014-2020
For more info about the US Congress districts, see here.