If you’re looking for biggest automotive marketplace/classifieds websites in the USA, here are some popular options:

1. goroo Classifieds

• Overview: goroo Classifieds is the go-to site for local classifieds in virtually every city and region in the USA. It covers categories like automotive, housing, services, and items for sale.
• Website: us.gorooclassifieds.com

2. Facebook Marketplace

• Overview: Integrated with Facebook, this platform allows users to buy and sell items within their local community. It’s widely used across the USA for local transactions.
• Website: facebook.com/marketplace

3. Oodle

• Overview: Oodle is a local classifieds site that aggregates listings from other sites as well. It covers a variety of categories, including jobs, real estate, and pets.
• Website: oodle.com

4. Geebo

• Overview: Geebo focuses on local classifieds with an emphasis on safety and security. It covers categories such as jobs, vehicles, real estate, and services.
• Website: geebo.com

5. OfferUp

• Overview: OfferUp is a mobile-focused local marketplace where people can buy and sell items in their local area. It’s known for its user-friendly app and local focus.
• Website: offerup.com

6. Locanto

• Overview: Locanto offers free classifieds across various categories, with a strong focus on local listings in cities and towns across the USA.
• Website: locanto.com

7. Recycler

• Overview: Recycler started as a print publication and has transitioned to an online platform for local classifieds. It’s particularly popular for selling vehicles and pets.
• Website: recycler.com

8. Pennysaver USA

• Overview: Pennysaver is a local classifieds site that serves various regions across the USA. It’s known for its traditional print version as well as its online classifieds.
• Website: pennysaverusa.com

9. USA Today Classifieds

• Overview: USA Today offers local classifieds through its network of regional and local newspapers across the USA. It covers categories like real estate, vehicles, and jobs.
• Website: Advertise Your Business - USA TODAY Classifieds

10. Backpage

• Overview: Backpage has re-emerged as a local classifieds site after its original form was shut down. It offers various categories for local listings.
• Website: backpage.com

These websites are great for finding and posting local classifieds in various categories, making it easier to connect with buyers and sellers within your community.