During 2011-12, we developed a number of redistricting-related resources here at Daily Kos Elections, due in large part to some tremendous hard work by jeffmd. We felt it would be useful to consolidate everything in one post, on a state-by-state basis, that can be saved as a handy bookmark. Here's what's on offer in the table below:
Maps: Jeff has created Google Maps overlays for the new congressional districts in every state. As Jeff explained, many states offer only very clunky maps, and the level of detail is very inconsistent from state-to-state. Our Google Maps overlays are all extremely detailed and of course utilize Google's familiar and easy-to-use interface. You can find each of these maps in the "Map" column. A special thanks to the GIS analysis firm Azavea (and Daniel McGlone in particular) for providing otherwise impossible-to-find data for some key states. (Note: California and Texas are split in half due to their large size.)
Since 2012, four states have undergone court-ordered changes to their congressional maps: Florida, North Carolina, Pennsylvania, and Virginia. We have updated maps for each of these states, thanks to great work by Stephen Wolf. For maps in effect earlier in the decade, see below:
Presidential Results by Congressional District: This data is an indispensable tool in any analyst's toolbox. However, while a handful of states provide election results broken down by congressional district, most do not. We've therefore the numbers for every state where such information isn't automatically available. This is a labor-intensive and time-consuming process, particularly since the raw data (in the form of county-level precinct results) is often difficult to gather. Many people have helped us with this project, including John Mifflin, roguemapper, and Daily Kos executive assistant Faith Gardner. You can find our calculations, as well as numbers from official sources where available, in the "Pres." column. You can also bookmark this link for all 435 districts in one place.
Redistribution Analyses: Knowing what share of each new districts' constituents is represented by which current incumbent is valuable information. These grids, created by Jeff, show you exactly how much of each old district makes up each new district. These numbers can help explain why a particular member of Congress chose to seek re-election in a particular district, and they can also show who had the geographic edge in incumbent-vs.-incumbent matchups. You can find these tables in the "Distr." column. You can also bookmark this link for access to all 50 tables in one spreadsheet.