Live US dealer listings Median-priced benchmark Updated 2026-10-15
Market price · Used 2020 GMC Sierra 3,438 listings tracked

Used 2020 GMC Sierra Price in the US

A used 2020 GMC Sierra in the US typically lists for $29,995–$41,652, with a median asking price of $35,093 across 3,438 active US dealer listings (as of 2026-10-15). The cheapest one listed right now is $14,900, a 2020 Fleet Base in Gainesville, GA — below 95% of the market, so expect high mileage, a base trim or a branded title — check the vehicle history.

Used 2020 GMC Sierra · asking prices3,438 listings
$20k$60k
Typical range
$29,995 – $41,652
Median
$35,093
Cheapest 5%
under $23,990
Cheapest listed now
$14,900

Browse by model year

typical price per year
More years (19)

Cheapest 10 listed right now

ranked by price
  1. 2020 GMC Sierra
    $14,900
    2020 GMC Sierra Fleet Base
    114,371 mi · Gainesville, GA · Lewis Page Auto Brokers
    View listing →
  2. 2020 GMC Sierra
    $15,595
    2020 GMC Sierra SLE
    210,710 mi · Glendale, AZ · Jim's Motors
    View listing →
  3. 2020 GMC Sierra
    $15,900
    2020 GMC Sierra Fleet Base
    167,000 mi · Dakota City, NE · DC Auto Sales
    View listing →
  4. 2020 GMC Sierra
    $15,980
    2020 GMC Sierra Denali
    214,438 mi · Denver, CO · STS Automotive
    View listing →
  5. 2020 GMC Sierra
    $15,995
    2020 GMC Sierra Fleet Base
    217,658 mi · Monroeville, AL · Wright Auto Sales,Inc.
    View listing →
  6. 2020 GMC Sierra
    $15,999
    2020 GMC Sierra Elevation
    174,219 mi · Burlington, NC · Prestige Preowned Inc
    View listing →
  7. 2020 GMC Sierra
    $16,166
    2020 GMC Sierra Fleet Base
    122,245 mi · Sandy, UT · Southtowne Mitsubishi
    View listing →
  8. 2020 GMC Sierra
    $16,223
    2020 GMC Sierra Fleet Base
    158,923 mi · San Antonio, TX · K-M-P Auto Group LLC
    View listing →
  9. 2020 GMC Sierra
    $16,500
    2020 GMC Sierra SLE
    205,000 mi · Battle ground, WA
    View listing →
  10. 2020 GMC Sierra
    $16,990
    2020 GMC Sierra Elevation
    171,488 mi · Gretna, LA · Gretna Auto Depot
    View listing →

These are the bottom of the market, not the going rate — every one is priced below 95% of active listings. A typical used 2020 GMC Sierra asks $29,995–$41,652. Cars this far under: expect high mileage, a base trim or a branded title — check the vehicle history.

FAQ

How much does a used 2020 GMC Sierra cost?

A used 2020 GMC Sierra in the US typically lists for $29,995 to $41,652, with a median asking price of $35,093 across 3,438 active US dealer listings. Nine in ten are priced between $23,990 and $55,611 (as of 2026-10-15, source: UnderMarket Cars).

Is $35,000 a good price for a used 2020 GMC Sierra?

That sits at about the market median ($35,093) for a used 2020 GMC Sierra. Under $29,995 puts you in the cheapest quarter of active US listings and under $23,990 in the cheapest 5%; above $55,611 is the priciest 5% (as of 2026-10-15).

What is the cheapest used 2020 GMC Sierra for sale right now?

$14,900 — a 2020 GMC Sierra Fleet Base in Gainesville, GA, $20,193 under the median (as of 2026-10-15).

Are these MSRP or real asking prices?

Real asking prices from active US dealer listings, deduplicated by VIN — not manufacturer MSRP. They already reflect dealer discounts, and they exclude tax, title, registration and dealer fees.

How often are prices updated?

The listing data behind UnderMarket Cars is rebuilt from live US dealer inventory every few hours, and this used 2020 GMC Sierra page is regenerated from it when it is requested. The figures on this page are from 2026-10-15.

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Prices updated 2026-10-15. Data covers active dealer listings across the USA.