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U.S. House districts won by Donald Trump and a Democrat in 2016
There were 13 Democratic-held U.S. House districts up for election in 2018 that Donald Trump (R) won in the 2016 presidential election.
Three of the districts flipped, voting in a Republican representative in 2018:
- Minnesota's 1st Congressional District
- Minnesota's 8th Congressional District
- Pennsylvania's 14th Congressional District
All three races were open seats. Minnesota's 1st Tim Walz successfully ran for governor, while Minnesota's 8th Rick Nolan did not seek re-election. Conor Lamb (D) successfully ran to represent Pennsylvania's 17th Congressional District.
Lamb had previously won a 2018 special election to replace U.S. Rep. Tim Murphy (R). This increased the number of Trump/Democratic districts in Pennsylvania from one to two. The districts in Pennsylvania were redrawn after the state Supreme Court ruled that the state's previous congressional map was unconstitutionally gerrymandered to favor Republicans. Read more below.
The 13 districts voted for Trump by as many as 30.8 percentage points and as few as 0.7 percentage points. In 2012, four voted for Mitt Romney (R) and nine voted for Barack Obama (D). Although they were scattered across the country, nine of the 13 districts were located in the midwest or the northeast.
Click here to see the 25 Republican-held districts won by Hillary Clinton (D) in 2016.
2018 election results
The following table shows the 2018 election results and 2016 and 2012 presidential margins for Democratic-held U.S. U.S. House districts won by Donald Trump in 2016.
| 2018 election results in Democratic-held U.S. House districts won by Donald Trump in 2016 | |||||
|---|---|---|---|---|---|
| District | Incumbent | 2018 winner | 2018 margin | 2016 presidential margin | 2012 presidential margin |
| Arizona's 1st |  Tom O'Halleran |
Tom O'Halleran |
D+7.7 | Trump+1.1 | Romney+2.5 |
| Iowa's 2nd | Dave Loebsack |
Dave Loebsack |
D+12.2 | Trump+4.1 | Obama+13.1 |
| Illinois' 17th | Cheri Bustos |
Cheri Bustos |
D+23.6 | Trump+0.7 | Obama+17.0 |
| Minnesota's 1st | Tim Walz |
 Jim Hagedorn |
R+0.4 | Trump+14.9 | Obama+1.4 |
| Minnesota's 7th | Collin Peterson |
Collin Peterson |
D+4.3 | Trump+30.8 | Romney+9.8 |
| Minnesota's 8th | Rick Nolan |
Pete Stauber |
R+5.5 | Trump+15.6 | Obama+5.5 |
| New Hampshire's 1st | Carol Shea-Porter |
Chris Pappas |
D+11.7 | Trump+1.6 | Obama+1.6 |
| New Jersey's 5th | Josh Gottheimer |
Josh Gottheimer |
D+11.7 | Trump+1.1 | Romney+3.1 |
| Nevada's 3rd | Jacky Rosen |
Susie Lee |
D+9.1 | Trump+1.0 | Obama+0.8 |
| New York's 18th | Sean Patrick Maloney |
Sean Patrick Maloney |
D+10.2 | Trump+1.9 | Obama+4.3 |
| Pennsylvania's 8th | Matt Cartwright[1] |
Matt Cartwright |
D+9.2 | Trump+9.6 | Obama+11.9 |
| Pennsylvania's 14th | Conor Lamb[2] |
Guy Reschenthaler |
R+15.9 | Trump+29.0 | Romney+17.7 |
| Wisconsin's 3rd | Ron Kind |
Ron Kind |
D+19.4 | Trump+4.5 | Obama+11.0 |
Map of Democratic-held districts won by Trump
2018 redistricting in Pennsylvania
On February 19, 2018, the Pennsylvania Supreme Court adopted a new congressional district map after ruling that the original map constituted an illegal partisan gerrymander. District locations and numbers were changed by the new map. Click here for more information about the ruling.
Prior to the redistricting, there were two districts that elected a Democrat and voted for Trump: the old 17th District represented by Matt Cartwright (D) and the old 18th District which elected Conor Lamb (D) in a March 2018 special election. After the redistricting, there were two districts that closely resembled these districts: the new 8th (Cartwright) and the new 14th (Lamb). Cartwright filed to run for re-election in the new 8th district. Lamb filed to run in the new 17th District, which most closely resembled the old 12th District held by Keith Rothfus (R) but only voted for Trump by 2.5 percentage points compared to Trump's 29 percentage point victory in the new 14th District.
The chart below compares the new districts with the old districts that were the most geographically similar to them.
Split congressional districts historically
From 1900 to 2016, the percentage of congressional districts that voted for a presidential candidate of one party and a U.S. representative from a different party ranged from 1.6 percent (five districts) in 1904 to 44.1 percent (192 districts) in 1972.[8] The 2016 election had the sixth fewest split districts since 1904 with 8.0 percent (35 total).
Click on the box below to see the data used in the graph.
| Split congressional districts, 1900-2016 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Year | Districts analyzed[9] | Split districts | Split districts (%) | ||||||||||
| 1900 | 295 | 10 | 3.4% | ||||||||||
| 1904 | 310 | 5 | 1.6% | ||||||||||
| 1908 | 314 | 21 | 6.7% | ||||||||||
| 1912 | 333 | 84 | 25.2% | ||||||||||
| 1916 | 333 | 35 | 10.5% | ||||||||||
| 1920 | 344 | 11 | 3.2% | ||||||||||
| 1924 | 356 | 42 | 11.8% | ||||||||||
| 1928 | 359 | 68 | 18.9% | ||||||||||
| 1932 | 355 | 50 | 14.1% | ||||||||||
| 1936 | 361 | 51 | 14.1% | ||||||||||
| 1940 | 362 | 53 | 14.6% | ||||||||||
| 1944 | 367 | 41 | 11.2% | ||||||||||
| 1948 | 422 | 90 | 21.3% | ||||||||||
| 1952 | 435 | 84 | 19.3% | ||||||||||
| 1956 | 435 | 130 | 29.9% | ||||||||||
| 1960 | 437 | 114 | 26.1% | ||||||||||
| 1964 | 435 | 145 | 33.3% | ||||||||||
| 1968 | 435 | 139 | 32.0% | ||||||||||
| 1972 | 435 | 192 | 44.1% | ||||||||||
| 1976 | 435 | 124 | 28.5% | ||||||||||
| 1980 | 435 | 143 | 32.9% | ||||||||||
| 1984 | 435 | 190 | 43.7% | ||||||||||
| 1988 | 435 | 148 | 34.0% | ||||||||||
| 1992 | 435 | 100 | 23.0% | ||||||||||
| 1996 | 435 | 110 | 25.3% | ||||||||||
| 2000 | 435 | 86 | 19.8% | ||||||||||
| 2004 | 435 | 59 | 13.6% | ||||||||||
| 2008 | 435 | 83 | 19.1% | ||||||||||
| 2012 | 424[10] | 25 | 5.9% | ||||||||||
| 2016 | 435 | 35[11] | 8.0% | ||||||||||
| Source: Brookings Institute | |||||||||||||
See also
- U.S. House battlegrounds, 2018
- United States Congress elections, 2018
- United States House of Representatives elections, 2018
- United States House of Representatives
Footnotes
- ↑ The new 8th district was created in early 2018 due to court-ordered redistricting and most closely resembles the old 17th District held by Cartwright. Click here to read more.
- ↑ The new 14th district was created in early 2018 due to court-ordered redistricting and most closely resembles the old 18th District Lamb won in a March 2018 special election. Tim Murphy (R) won the old 18th District in the 2016 election. Click here to read more.
- ↑ The old 1st and 11th Districts did not make up a plurality of any of the new districts. The 1st District went for Hillary Clinton by 61.3 percentage points and was represented by Bob Brady (D). The 11th District went for Donald Trump by 23.8 percentage points and was represented by Lou Barletta (R).
- ↑ District 13 incumbent Brendan Boyle (D) filed for re-election in the new 2nd District.
- ↑ District 17 incumbent Matt Cartwright (D) filed for re-election in the new 8th District.
- ↑ Lamb was elected in a March 2018 special election to replace Rep. Tim Murphy (R).
- ↑ Lamb filed to run for PA-17 in the 2018 election.
- ↑ The number of districts available for analysis changes year-by-year.
- ↑ Before 1952 complete data are not available on every congressional district.
- ↑ The original data source did not have complete information due to the damage caused by Hurricane Sandy the month before the 2012 presidential election.
- ↑ Three congressional districts from Pennsylvania that were created in the 2018 redistricting are excluded from this figure.
