Using data from the Daily Kos, specifically this dataset which uses the 2016 congressional district boundaries, we can see that 108 of the 435 districts were won by a margin of 40% or more. 75 of these were won by Clinton, with the remaining 33 won by Trump. Full CSV data separated out by winner is below. From this, I've created the below map showing Trump districts in red, and Clinton districts in blue.

You may also find the below image from Wikipedia useful - this also uses the linked dataset.

Mr.Election & Ali Zifan / CC BY-SA
Clinton districts:
CD,Incumbent,Party,Clinton,Trump,Difference
NY-15,"Serrano, Jose",(D),93.8,4.9,88.9
NY-13,"Espaillat, Adriano",(D),92.3,5.4,86.9
PA-02,"Evans, Dwight",(D),90.4,7.6,82.8
CA-13,"Lee, Barbara",(D),87.4,6.8,80.6
IL-07,"Davis, Danny",(D),87.4,9.2,78.2
CA-12,"Pelosi, Nancy",(D),86.2,8.7,77.5
NY-07,"Velazquez, Nydia",(D),86.9,10.4,76.5
CA-37,"Bass, Karen",(D),85.7,9.6,76.1
GA-05,"Lewis, John",(D),85.0,11.9,73.1
NY-05,"Meeks, Gregory",(D),85.7,12.7,73
CA-34,"Gomez, Jimmy",(D),83.6,10.7,72.9
NJ-10,"Payne, Donald",(D),85.2,12.8,72.4
MA-07,"Capuano, Mike",(D),84.1,11.9,72.2
NY-08,"Jeffries, Hakeem",(D),84.6,13.5,71.1
CA-44,"Barragan, Nanette",(D),83.0,12.3,70.7
WA-07,"Jayapal, Pramila",(D),82.1,12.2,69.9
NY-12,"Maloney, Carolyn",(D),83.3,13.5,69.8
CA-40,"Roybal-Allard, Lucille",(D),82.2,12.8,69.4
NY-09,"Clarke, Yvette",(D),83.5,14.4,69.1
IL-04,"Gutierrez, Luis",(D),82.1,13.2,68.9
FL-24,"Wilson, Frederica",(D),82.9,15.4,67.5
OH-11,"Fudge, Marcia",(D),80.5,17.0,63.5
FL-20,"Hastings, Alcee",(D),80.2,18.1,62.1
CA-43,"Waters, Maxine",(D),78.4,16.7,61.7
PA-01,"Brady, Bob",(D),79.5,18.2,61.3
TX-09,"Green, Al",(D),79.3,18.0,61.3
CA-29,"Cardenas, Tony",(D),77.7,16.8,60.9
MI-14,"Lawrence, Brenda",(D),79.2,18.3,60.9
TX-30,"Johnson, E.B.",(D),79.1,18.3,60.8
MI-13,"Conyers, John",(D),78.8,18.1,60.7
NY-10,"Nadler, Jerrold",(D),78.3,18.8,59.5
IL-02,"Kelly, Robin",(D),78.0,19.1,58.9
CA-14,"Speier, Jackie",(D),76.9,18.2,58.7
MO-01,"Clay, Lacy",(D),77.0,18.8,58.2
NY-14,"Crowley, Joe",(D),77.7,19.8,57.9
TN-09,"Cohen, Steve",(D),77.5,19.8,57.7
MD-04,"Brown, Anthony",(D),77.2,19.7,57.5
TX-18,"Jackson-Lee, Sheila",(D),76.5,20.0,56.5
MD-07,"Cummings, Elijah",(D),75.8,20.2,55.6
MN-05,"Ellison, Keith",(D),73.7,18.5,55.2
NJ-08,"Sires, Albio",(D),75.7,21.5,54.2
IL-01,"Rush, Bobby",(D),75.4,21.4,54
CA-17,"Khanna, Ro",(D),73.9,20.5,53.4
CA-18,"Eshoo, Anna",(D),73.4,20.2,53.2
GA-04,"Johnson, Hank",(D),75.3,22.2,53.1
VA-08,"Beyer, Don",(D),73.5,20.9,52.6
NY-16,"Engel, Eliot",(D),75.1,22.5,52.6
LA-02,"Richmond, Cedric",(D),74.6,22.2,52.4
WI-04,"Moore, Gwen",(D),74.0,21.8,52.2
CA-19,"Lofgren, Zoe",(D),72.9,21.5,51.4
CA-28,"Schiff, Adam",(D),72.1,22.3,49.8
TX-33,"Veasey, Marc",(D),72.9,23.7,49.2
AZ-07,"Gallego, Ruben",(D),71.8,22.6,49.2
CA-51,"Vargas, Juan",(D),71.8,22.8,49
CA-11,"DeSaulnier, Mark",(D),71.5,22.7,48.8
OR-03,"Blumenauer, Earl",(D),70.7,22.5,48.2
CA-20,"Panetta, Jimmy",(D),70.4,23.2,47.2
WA-09,"Smith, Adam",(D),70.5,23.3,47.2
IL-05,"Quigley, Mike",(D),70.5,23.9,46.6
CO-01,"DeGette, Diana",(D),69.0,23.2,45.8
CA-02,"Huffman, Jared",(D),69.0,23.3,45.7
CA-15,"Swalwell, Eric",(D),69.9,24.2,45.7
TX-29,"Green, Gene",(D),71.1,25.4,45.7
IL-09,"Schakowsky, Jan",(D),70.1,24.9,45.2
CA-05,"Thompson, Mike",(D),69.2,24.3,44.9
CA-06,"Matsui, Doris",(D),69.2,24.4,44.8
GA-13,"Scott, David",(D),71.0,26.6,44.4
MA-05,"Clark, Katherine",(D),69.3,25.7,43.6
CA-30,"Sherman, Brad",(D),69.1,25.7,43.4
CA-33,"Lieu, Ted",(D),67.8,26.5,41.3
AL-07,"Sewell, Terri",(D),69.8,28.6,41.2
CA-35,"Torres, Norma",(D),67.7,26.9,40.8
TX-16,"O'Rourke, Beto",(D),67.9,27.2,40.7
NC-12,"Adams, Alma",(D),68.4,28.4,40
NC-04,"Price, David",(D),68.2,28.2,40
Trump Districts:
CD,Incumbent,Party,Clinton,Trump,Difference
AL-04,"Aderholt, Rob",(R),17.4,80.4,63
TX-13,"Thornberry, Mac",(R),16.9,79.9,63
KY-05,"Rogers, Hal",(R),17.5,79.6,62.1
TX-11,"Conaway, Michael",(R),19.1,77.8,58.7
GA-09,"Collins, Doug",(R),19.3,77.8,58.5
TN-01,"Roe, Phil",(R),19.7,76.7,57
NE-03,"Smith, Adrian",(R),20.0,74.9,54.9
MO-08,"Smith, Jason",(R),21.0,75.4,54.4
TX-04,"Ratcliffe, John",(R),21.8,75.4,53.6
GA-14,"Graves, Tom",(R),22.1,75.0,52.9
OK-03,"Lucas, Frank",(R),20.9,73.6,52.7
OK-02,"Mullin, Markwayne",(R),22.8,72.9,50.1
WV-03,"Jenkins, Evan",(R),23.3,72.5,49.2
TX-19,"Arrington, Jodey",(R),23.5,72.5,49
TN-06,"Black, Diane",(R),23.7,72.6,48.9
TX-08,"Brady, Kevin",(R),23.9,72.7,48.8
KY-01,"Comer, James",(R),23.9,72.4,48.5
WY-AL,"Cheney, Liz",(R),22.5,70.1,47.6
TX-01,"Gohmert, Louie",(R),25.3,72.2,46.9
TX-36,"Babin, Brian",(R),25.2,72.0,46.8
IL-15,"Shimkus, John",(R),24.5,70.7,46.2
MO-07,"Long, Billy",(R),24.7,70.4,45.7
KS-01,"Marshall, Roger",(R),24.3,69.3,45
AL-06,"Palmer, Gary",(R),26.1,70.8,44.7
OH-06,"Johnson, Bill",(R),26.7,69.3,42.6
PA-09,"Schuster, Bill",(R),27.2,69.7,42.5
LA-01,"Scalise, Steve",(R),26.7,68.7,42
WV-01,"McKinley, David",(R),26.4,68.0,41.6
VA-09,"Griffith, Morgan",(R),27.3,68.8,41.5
MS-04,"Palazzo, Steven",(R),28.2,69.4,41.2
TN-04,"DesJarlais, Scott",(R),27.4,68.6,41.2
IN-06,"Messer, Luke",(R),27.4,67.7,40.3
AZ-04,"Gosar, Paul",(R),27.5,67.7,40.2