Washington's 1st congressional district
Washington's 1st congressional district encompasses the majority of Whatcom, Skagit, and Snohomish counties, as well as nearly one-third of King County. The eastern edge of the district follows county lines from the Canada–US border down to the I-90 corridor. Then it follows I-90 west to West Lake Sammamish, and from there north to I-5. The western border follows the I-5 corridor north to Bellingham, then along the coast to Canada.

The 2012 redistricting drastically changed the 1st district. Much of this area was previously part of the 2nd district, but in the new map the 2nd has shrunk significantly. Jay Inslee (D) was the representative of the 1st District until resigning to run for Governor of the state, but most of the district has been represented by Rick Larsen (D), of the 2nd District, in the past.

Soon after the 2012 general election polls closed, the Seattle Times and national news organizations called the district for Democrat Suzan DelBene, defeating Republican John Koster with a margin that the Seattle Times called "unexpectedly decisive", reflecting the difficulty of predicting the vote in the new district. The certified results confirmed her significant margin. DelBene also won the election for the remainder of Inslee's term in the old First District, and after being sworn in on November 13, 2012.

In presidential elections, the 1st District has leaned Democratic. Under the old boundaries, Al Gore and John Kerry narrowly carried the district in 2000 and 2004 with 48% and 51% of the vote, respectively. In 2008, Barack Obama swept the district with 55.60% of the vote while John McCain received 42%.
Q156623
Whatcom
LOC
Q113892
Skagit
LOC
Q110403
Snohomish
LOC
Q108861
King County
LOC
Q119515
Canada–US border
Concept
Q830862
I-90
LOC
Q2744334
Lake Sammamish
LOC
Q830648
I-5
LOC
Q430267
Bellingham
LOC
Q1100710
Jay Inslee
PER
Q878264
Governor
Concept
Q503529
Rick Larsen
PER
Q7971537
2nd District
Concept
Q221718
Seattle Times
MEDIA
Q29552
Democrat
Concept
Q2091892
Suzan DelBene
PER
Q29468
Republican
Concept
Q16149233
John Koster
PER
Q221718
Seattle Times
MEDIA
Q19673
Al Gore
PER
Q22316
John Kerry
PER
Q327959
2000
Concept
Q464075
2004
Concept
Q45578
2008
Concept
Q76
Barack Obama
PER
Q10390
John McCain
PER
Q7971523
Washington's 1st congressional district
Concept
2012-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2012
DATE
2012-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2012
DATE
2012-11-13T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
November 13, 2012
DATE
2000-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2000
DATE
2004-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2004
DATE
2008-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
2008
DATE
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1
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-90^^http://www.w3.org/2001/XMLSchema#decimal
-90
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-90^^http://www.w3.org/2001/XMLSchema#decimal
-90
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-5^^http://www.w3.org/2001/XMLSchema#decimal
-5
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-5
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1
NUMBER
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2
NUMBER
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2
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
+1^^http://www.w3.org/2001/XMLSchema#decimal
1
NUMBER
+48^^http://www.w3.org/2001/XMLSchema#decimal
48
NUMBER
+51^^http://www.w3.org/2001/XMLSchema#decimal
51
NUMBER
+55.60^^http://www.w3.org/2001/XMLSchema#decimal
55.60
NUMBER
+42^^http://www.w3.org/2001/XMLSchema#decimal
42
NUMBER
opposite of
member of political party
opposite of
member of political party
candidate
follows
successful candidate
candidate