CoPilot AI-Assisted Car Shopping

 New Search
 Save
 Sort
 Share

Used 2018 GMC Sierra 1500 for Sale in Seattle, WA

Sierra 1500s for Sale at Dealers

Filters
Price
Year
Mileage
Trim
2019 GMC Sierra 1500 Denali 4WD photo
21
2019 GMC Sierra 1500 Denali 4WD • Marysville, WA
6.2L V8 Engine
$43,971 • 28.3k miles
•••

#21 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • Good Price - $2,488 Below Market
  • Includes $1,697 Premium Upgrades
  • Very Low Mileage
More details
2017 GMC Sierra 1500 Denali 4WD photo
2017 GMC Sierra 1500 Denali 4WD • Everett, WA
White • 5.3L V8 Engine
$20,991 • 170k miles
•••

#38 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B” Buy

  • Good Price - $732 Below Market
  • Includes $742 Premium Upgrades
  • Dealer Rating - 4.5 stars
More details
2019 GMC Sierra 1500 AT4 4WD photo
2019 GMC Sierra 1500 AT4 4WD • Lynnwood, WA
Gray • 5.3L V8 Engine
$39,995 • 65.4k miles
•••

#69 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “D+” Buy

  • Includes $1,920 Premium Upgrades
  • Very Low Mileage
  • Dealer Rating - 4.4 stars
More details
2020 GMC Sierra 1500 Denali 4WD photo
Price Drop
2020 GMC Sierra 1500 Denali 4WD • Auburn, WA
Black • 6.2L V8 Engine
$33,994 • 99.7k miles
•••

#44 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B” Buy

  • $999 Price Drop
  • Fair Price - $379 Below Market
  • Includes $7,205 Premium Upgrades
More details
2020 GMC Sierra 1500 SLT 4WD photo
25
Price Drop
2020 GMC Sierra 1500 SLT 4WD • Tacoma, WA
Silver • 3.0L I6 Engine
$29,900 • 115.6k miles
•••

#25 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $1,000 Price Drop
  • Good Price - $1,543 Below Market
  • Includes $4,039 Premium Upgrades
More details
2020 GMC Sierra 1500 Elevation 4WD photo
2020 GMC Sierra 1500 Elevation 4WD • Bellevue, WA
Silver • 3.0L I6 Engine
$38,988 • 29.4k miles
•••

#35 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • Fair Price - $732 Below Market
  • Includes $4,095 Premium Upgrades
  • Motivation to Negotiate - Increasing
More details
2020 GMC Sierra 1500 Denali 4WD photo
Price Drop
2020 GMC Sierra 1500 Denali 4WD • Lynnwood, WA
White • 3.0L I6 Engine
$35,495 • 75.2k miles
•••

#54 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B-” Buy

  • $500 Price Drop
  • Fair Price - $488 Above Market
  • Includes $1,206 Premium Upgrades
More details
2017 GMC Sierra 1500 Denali 4WD photo
Price Drop
2017 GMC Sierra 1500 Denali 4WD • Kirkland, WA
Black • 6.2L Engine
$31,895 • 80.8k miles
•••

#59 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “C+” Buy

  • $100 Price Drop
  • Includes $5,643 Premium Upgrades
  • Very Low Mileage
More details
2020 GMC Sierra 1500 Elevation 4WD photo
6
Price Drop
2020 GMC Sierra 1500 Elevation 4WD • Everett, WA
Black • 3.0L I6 Engine
$35,995 • 47.6k miles
•••

#6 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $998 Price Drop
  • Great Price - $4,966 Below Market
  • Includes $7,583 Premium Upgrades
More details
2020 GMC Sierra 1500 Elevation 4WD photo
2020 GMC Sierra 1500 Elevation 4WD • Lynden, WA
White • 2.7L I4 Engine
$33,850 • 66.6k miles
•••

#79 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “D-” Buy

  • Below Average Mileage
More details
2017 GMC Sierra 1500 Denali 4WD photo
2017 GMC Sierra 1500 Denali 4WD • Port Angeles, WA
Gray • 6.2L V8 Engine
$30,735 • 72.6k miles
•••

#72 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “D” Buy

  • Includes $1,203 Premium Upgrades
  • CARFAX: One Owner
  • Very Low Mileage
More details
2020 GMC Sierra 1500 AT4 4WD photo
5
Price Drop
2020 GMC Sierra 1500 AT4 4WD • Bellevue, WA
White • 6.2L V8 Engine
$32,787 • 90.6k miles
•••

#5 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $595 Price Drop
  • Great Price - $5,300 Below Market
  • Includes $8,140 Premium Upgrades
More details
2020 GMC Sierra 1500 Denali 4WD photo
2020 GMC Sierra 1500 Denali 4WD • Renton, WA
Gray • 5.3L V8 Engine
$37,995 • 68.5k miles
•••

#78 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “D-” Buy

  • Includes $591 Premium Upgrades
  • CARFAX: One Owner
  • Below Average Mileage
More details
2019 GMC Sierra 1500 AT4 4WD photo
15
2019 GMC Sierra 1500 AT4 4WD • Fife, WA
Brown • 6.2L V8 Engine
$33,000 • 94.5k miles
•••

#15 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • Great Price - $3,106 Below Market
  • Includes $6,700 Premium Upgrades
  • Average Mileage
More details
2018 GMC Sierra 1500 Denali 4WD photo
18
Price Drop
2018 GMC Sierra 1500 Denali 4WD • Auburn, WA
Red • 6.2L Engine
$28,994 • 92.9k miles
•••

#18 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $999 Price Drop
  • Great Price - $2,837 Below Market
  • Includes $5,861 Premium Upgrades
More details
2020 GMC Sierra 1500 SLT 4WD photo
2020 GMC Sierra 1500 SLT 4WD • Federal Way, WA
Red • 5.3L V8 Engine
$36,000 • 82.8k miles
•••

#57 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “C+” Buy

  • Fair Price - $390 Above Market
  • Includes $356 Premium Upgrades
  • Average Mileage
More details
2018 GMC Sierra 1500 Denali 4WD photo
2018 GMC Sierra 1500 Denali 4WD • Everett, WA
Silver • 6.2L Engine
$28,788 • 116.3k miles
•••

#31 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • Good Price - $1,030 Below Market
  • Includes $5,221 Premium Upgrades
  • CARFAX: One Owner
More details
2020 GMC Sierra 1500 AT4 4WD photo
1
Price Drop
2020 GMC Sierra 1500 AT4 4WD • Marysville, WA
White • 6.2L V8 Engine
$41,864 • 21.1k miles
•••

#1 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $464 Price Drop
  • Great Price - $8,052 Below Market
  • Includes $11,230 Premium Upgrades
More details
2019 GMC Sierra 1500 SLE 4WD photo
Price Drop
2019 GMC Sierra 1500 SLE 4WD • Federal Way, WA
White • 5.3L V8 Engine
$29,122 • 93.5k miles
•••

#84 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “D-” Buy

  • $366 Price Drop
  • Includes $763 Premium Upgrades
  • CARFAX: One Owner
More details
2018 GMC Sierra 1500 SLT 4WD photo
19
Price Drop
2018 GMC Sierra 1500 SLT 4WD • Mount Vernon, WA
White • 5.3L V8 Engine
$22,899 • 123.7k miles
•••

#19 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $351 Price Drop
  • Great Price - $2,649 Below Market
  • Includes $5,574 Premium Upgrades
More details
2020 GMC Sierra 1500 Elevation 4WD photo
17
2020 GMC Sierra 1500 Elevation 4WD • Port Angeles, WA
Gray • 3.0L I6 Engine
$27,979 • 115.9k miles
•••

#17 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • Great Price - $2,933 Below Market
  • Includes $4,012 Premium Upgrades
  • Motivation to Negotiate - Very High
More details
2020 GMC Sierra 1500 Denali 4WD photo
Price Drop
2020 GMC Sierra 1500 Denali 4WD • Puyallup, WA
Black • 3.0L I6 Engine
$35,697 • 104.8k miles
•••

#47 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B” Buy

  • $290 Price Drop
  • Fair Price - $223 Below Market
  • Includes $9,055 Premium Upgrades
More details
2019 GMC Sierra 1500 4WD photo
Price Drop
2019 GMC Sierra 1500 4WD • Lynden, WA
5.3L V8 Engine
$21,850 • 95.3k miles
•••

#66 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “C-” Buy

  • Includes $795 Premium Upgrades
  • Motivation to Negotiate - Very High
  • Average Mileage
More details
2020 GMC Sierra 1500 AT4 4WD photo
Price Drop
2020 GMC Sierra 1500 AT4 4WD • Anacortes, WA
6.2L V8 Engine
$45,577 • 30k miles
•••

#32 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “B+” Buy

  • $2,200 Price Drop
  • Fair Price - $1,007 Below Market
  • Includes $8,854 Premium Upgrades
More details
2016 GMC Sierra 1500 SLT 4WD photo
2016 GMC Sierra 1500 SLT 4WD • Issaquah, WA
Black • 5.3L V8 Engine
$21,991 • 139.6k miles
•••

#58 2016-2020 GMC Sierra 1500

CoPilot AI: It’s a “C+” Buy

  • Fair Price - $599 Above Market
  • Average Mileage
  • Dealer Rating - 4.4 stars
More details
1-25 of 108 results
HomeGMCSierra 1500

2018 GMC Sierra 1500

Half-Ton Truck
Seats
6
Fuel Economy
16City MPG
22Hwy MPG
NHTSA Rating Summary
Copilot Rating
Dimensions
Most Popular Models like Sierra 1500
GMC Sierra 1500 near Seattle, WA
Other Years
View more Crew Cab Pickups

© 2026 CoPilot. All Rights Reserved.