CORE’s SUPRA system covers Mercer County, and includes access to Burlington, Camden, Gloucester, and Salem counties. We also have a number of reciprocities where you can get access with your CORE SUPRA eKey without paying for an additional key— find a complete list of our reciprocities below. 


Already have a SUPRA key and need to activate a reciprocity? Email with your key’s serial number, PIN, and where it was originally issued (see list below).


Questions about how SUPRA works or common troubleshooting issues? Find many answers in our FAQ section here.


SUPRA Support

For SUPRA eKey or keybox support during business hours, contact CORE Association of REALTORS® at 609-392-3666, Option 1. If you need assistance with your SUPRA eKey after CORE business hours or during the weekend, please contact SUPRA Support at 877-699-6787 or email


Steps to Setup CORE SUPRA eKey*


Step 1: Email to request an appointment. Appointments are over-the-phone, Monday-Friday, 10 am to 3 pm, and typically take less than 30 minutes.

Step 2: Review the Keyholder Agreemenhere.

Step 3: Review CORE’s SUPRA Rules & Regulations here. The signed document must be submitted by your scheduled appointment time.

Step 4: Download the app before your appointment by searching for “SUPRA eKey” in your app store.

Step 5: Complete your phone appointment with CORE staff.

Step 6: Activate/confirm any needed reciprocities from the list below.


*CORE only issues and services the SUPRA eKey that uses an app on your phone. Any physical keys having issues that SUPRA Support can’t fix will need to be upgraded to the eKey.


SUPRA eKey Costs

Monthly service fee: Basic – $21.53 Now $20.53 | Professional – $27.96 Now $20.53*

One-time Activation fee: $50 plus tax 


*Professional monthly fee returns to $27.96 after October 12. Email to return to Basic before November 12.



CORE and Supra have partnered together to bring current Mercer County eKeyholders an eKEY Professional promotional offer. From May 4 until October 12, you can use the Supra eKEY Pro features at the eKEY Basic price. For more information, click here.


CORE’s SUPRA Reciprocities

Please note that the counties listed are subject to change as MLS and Association areas change. Contact the organization listed for the most up-to-date list of their service area.


Bucks County Association of REALTORS (Pennsylvania): Adams, Berks, Carbon, Chester, Cumberland, Dauphin, Delaware, Lancaster, Lebanon, Lehigh Valley, Monroe, Montgomery, North Hampton, Perry, Philadelphia, Schuylkill, and York counties in Pennsylvania

Must be licensed in PA to get access. Provide your serial number, PIN, and that your key is from CORE to activate reciprocity.

Contact: 215-956-9176 x102 or


Central Jersey MLS (previously Middlesex MLS): Middlesex County

Reciprocity should be automatic, but glitches do happen. Provide your serial number, PIN, and that your key is from CORE to confirm reciprocity.



Garden State MLS: Bergen, Essex, Hudson, Hunterdon, Morris, Passaic, Somerset, Sussex, Union, and Warren counties

Membership with GSMLS is required to activate the reciprocity. Follow the steps here to submit your request online to GSMLS.

Contact: 973-898-1900 or


Liberty Board of REALTORS/Hudson County MLS: Hudson County

Membership with the Board/MLS is required to activate the reciprocity.

Contact: 201-867-4415 or


Monmouth Ocean Regional REALTORS/MLS: Monmouth and Ocean counties

Reciprocity should be automatic, but glitches do happen. Provide your serial number, PIN, and that your key is from CORE to confirm reciprocity.

Contact: 732-918-1340


Nexus Association of REALTORS: Burlington, Camden, and Ocean counties

Reciprocity with Nexus is automatic and does not require activation or confirmation. If you have issues accessing this area, contact CORE first for assistance.

Contact: 609-392-3666