Finding a sportswear manufacturer factory in the USA can be done through various methods:

1. Online Research: Utilize search engines like Google to find sportswear manufacturers in the USA. You can use keywords such as "sportswear manufacturer USA" or "athletic apparel factory" along with specific requirements like location or type of product.

2. Trade Directories and B2B Platforms: Explore online directories such as ThomasNet, Makers Row, or RISESPORTSWEAR, which list manufacturers across various industries, including sportswear. These platforms often allow you to filter by location, product type, and other criteria.

3. Trade Shows and Exhibitions: Attend trade shows and exhibitions related to sportswear and apparel manufacturing. These events provide opportunities to network with manufacturers, suppliers, and industry professionals and explore potential partnerships.

4. Industry Associations and Networks: Join industry associations or networks related to sportswear manufacturing in the USA. These organizations may offer directories, resources, and networking opportunities to help you connect with manufacturers.

5. Referrals and Recommendations: Ask for recommendations from other businesses in the sportswear industry or related fields. They may be able to refer you to reliable manufacturers they have worked with previously.

6. Social Media and Forums: Utilize social media platforms and industry-specific forums to connect with sportswear manufacturers in the USA. Join relevant groups or communities where professionals discuss manufacturing and sourcing.

7. Local Manufacturing Hubs: Research local manufacturing hubs or industrial areas known for apparel production in the USA. Visiting these areas or contacting local business organizations may help you identify potential manufacturers.

8. Supplier Directories: Some larger retailers and brands maintain supplier directories on their websites, listing the manufacturers and suppliers they work with. Exploring these directories may lead you to sportswear manufacturers in the USA.

9. Online Marketplaces: Explore online marketplaces like Alibaba or Global Sources, which may include listings from sportswear manufacturers based in the USA.

10. Online Reviews and Ratings: Check online reviews and ratings of sportswear manufacturers to gauge their reputation, reliability, and quality of service.

By leveraging these methods, you can identify and evaluate sportswear manufacturer factories in the USA to find the one that best suits your needs and requirements.