When selecting a US SEO company, several crucial factors should be examined. First, assess their track record and client testimonials to gauge their competence and reliability. Secondly, ensure they employ ethical, white-hat SEO practices to avoid potential penalties from search engines. Third, evaluate their understanding of your industry and target audience, as this knowledge is vital for crafting effective SEO strategies. Additionally, inquire about their communication and reporting processes to stay informed about progress. Finally, discuss pricing and contract terms to ensure they align with your budget and expectations. By thoroughly considering these factors, you can make an informed decision when choosing a US SEO company.