Passport issuance.
Passports are good for 10 years.
NOTICE: Some use of the passport they require 6 months validity remaining on the passport.
Example. To get a one-year extension of stay on a Thai Visa, the applicant’s passport must be valid for that entire year. And it can take up to 2 months to complete a renewal. Therefore you must initiate your passport renewal a good 14 months before its expiry date.
First-time application for a new passport is done at a post office in-person.
https://www.usps.com/international/passports.htm
Renewal from within the US cannot be done in-person. It must be done by mail and the application can be filed online.
Allow 4 weeks to receive documents.
https://travel.state.gov/content/travel/en/passports/have-passport/renew.html
Renewal from outside the US varies by country.
In most countries you apply in-person at the US consulate or embassy.
In some countries you may apply by mail.
https://travel.state.gov/content/travel/en/passports/need-passport/outside-us.html
Renewal from Thailand.
By mail.
Allow 6 to 8 weeks.
https://th.usembassy.gov/u-s-citizen-services/passports/adult-passport-renew/
Instructions.
Passport-by-Mail Service
*ACS/Consular Section*
U.S. Embassy
95 Wireless Road
Bangkok 10330, Thailand
After receiving the new book. Thai Immigration will transfer old stamps to the new book, including entry stamp, first non-o visa, and current retirement visa. 3000 THB to OS Thai Visa.