The U.S. Embassy in Quito and the U.S. Consulate in Guayaquil can only provide this service if you never had a Social Security number and are:

• U.S. Citizen
• Over 12 years old

To begin the process please send an e-mail to the location where you would like to apply:

U.S. Embassy in Quito: acsquito@state.gov
U.S. Consulate in Guayaquil: acsguayaquil@state.gov

If you are trying to request a SSN for someone that is 12 years old or younger, as well as all other inquiries and requests, you need to contact Regional Federal Benefits Office at San Jose, Costa Rica: https://cr.usembassy.gov/contact/#fbu

General information on SSA services for people living outside the United States can be found at https://www.ssa.gov/foreign/index.html