Alabama has 7 congressional districts, currently held by 6 republicans and a democrat. This will be the first election cycle since Alabama was redistricted in 2010. Redistricting is looking to have no appreciable effect on the congressional house races.
The following are heavily leaning districts:
1st (R)
3rd (R)
4th (R)
6th (R)
7th (D)
Martha Roby (R) is only in her first term as the 2nd district representative. She beat the incumbent democrat Bobby Bright in 2010, who was the only democrat to win this seat since the 60s. The margin of victory that unseated Bobby Bright was less than 6,000 votes. Redistricting did very little to this district, so polling numbers from 2010 can be used to forecast this race. This is the only highly contested district in Alabama. The voter turnout in the 2nd district is also in the bottom half of all seven districts, along with the 3rd and 6th districts.
Alabama's 5th congressional district is more contested than most of the others. Mo Brooks (R) is running for re-election for the first time, and Charlie Holley has been getting some good press in liberal circles in the 5th congressional district. The main problem with Holley will be cash. Mo Brooks has many times the cash on hand for this congressional race and can definitely use this to his advantage.
Final summary:
Heavily leaning left: 1
Slightly leaning left: 0
Slightly leaning right: 2
Heavily leaning right: 4