In general, a person who wishes to immigrate to the United States must have a petition approved by the U.S. Citizenship and Immigration Services (USCIS) before applying for an immigrant visa. Specific information about filing immigrant petitions is available on the U.S. Department of State website. Since the U.S. Embassy in Oslo has no USCIS office presence in Norway, the Embassy will only be able to accept and process form I-130 in exceptional circumstances as outlined below.
Petitioners who would like to file a I-130 application for an alien relative based on exceptional circumstances should e-mail the U.S. Embassy in Oslo at osloLPR@state.gov with an explanation of the exceptional circumstance. For a detailed explanation of what qualifies as an exceptional circumstance, please visit the USCIS website. Your e-mail should also include evidence of the exceptional circumstance in the form of an attachment (documentation of job transfer, military orders, medical emergency, etc.). The U.S. Embassy in Oslo will forward your exceptional filing request to USCIS, which will determine whether or not your situation merits an approval to file your application in Oslo. If your request is approved, the U.S. Embassy in Oslo will contact you with further instructions.
If your circumstance does not qualify as exceptional by USCIS, then you must file the petition with the USCIS Chicago Lockbox.