Where can I apply for a Social Security Number?
If you reside in Uruguay and have questions regarding services provided by the Social Security Administration (SSA), you must contact the SSA Federal Benefits Unit (FBU) located in Buenos Aires, Argentina: https://ar.usembassy.gov/social-security/
General information on SSA services for people living outside the United States can be found at https://www.ssa.gov/foreign/index.html