If you marry a US citizen outside usa can still apply for residency?

Yes, if you marry a US citizen outside of the United States, you can still apply for residency. The process is called consular processing, and it involves submitting an application to the nearest US embassy or consulate. You will need to provide evidence of your marriage, such as a marriage certificate, as well as other supporting documents. If your application is approved, you will be issued an immigrant visa, which allows you to enter the United States and become a lawful permanent resident.