The mailing address where you should send your duly completed Form I-485, Application to Register Permanent Residence or Adjust Status, depends on your eligibility category.
In order to determine where exactly you must mail Form I-485 in your particular case, you should visit the official USCIS website and consult the list called “Direct Filing Addresses for Form I-485, Application to Register Permanent Residence or Adjust Status” (https://www.uscis.gov/i-485-addresses).
Please also note that you may additionally submit Form G-1145, E-Notification of Application/Petition Acceptance, in case you want to receive an e-mail and/or a text message confirming that your Form I-485 has been accepted by the USCIS Lockbox facility.