How can I find out what office granted me permanent resident status? (I-90)

Find the office that granted me permanent resident status (I-90)

According to the USCIS filing instructions, this location is the U.S. Embassy, U.S. Consulate, or USCIS office where you were issued an immigrant visa or that granted your lawful permanent residence status. This information can be located on the paperwork you received from the USCIS or U.S. Consulate who issued your green card. If you are unable to locate the information or the information is unknown be prepared to submit a brief explanation to the immigration officer. CITATION: Page 7, Part 3, Item Num 2; http://www.uscis.gov/sites/default/files/files/form/i-90instr.pdf