HOW DO YOU CHOOSE?

There are thousands of Electronic Manufacturing Service (EMS) companies in the USA, with one source estimating over 4,000 providers, while another report counts 12,808 total electronics and electrical equipment facilities, which would include EMS providers. The exact number varies depending on the source and the criteria for what constitutes an EMS company. 

There is no single, definitive total number of Electronic Manufacturing Service (EMS) companies outside the USA, but China, Taiwan, and South Korea host a significant majority of the world's largest EMS companies and have the largest market shares. It is more accurate to say that a vast number of EMS companies are located outside the US rather than giving a single figure.