Hey, @ChrisSosa1337 
Thanks for your question! Have you tried using the Get contacts in a list endpoint? This endpoint allows us to add query params such as `property`.
The Get a list by ID endpoint doesn’t offer additional query params.
Here’s a quick example:
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Gave zip codes to five test contacts
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I created a List in my portal – last name = Belcher And portal code (zip) is known
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Used the endpoint – Get contacts in a list
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Added the additional query params to my request
https://api.hubapi.com/contacts/v1/lists/50/contacts/all/?property=zip&property=firstname&property=lastname -
The contacts and the additional properties are returned in the response
{ "contacts": [ { "vid": 801, "canonical-vid": 801, "merged-vids": [], "portal-id": 22245342, "is-contact": true, "properties": { "zip": { "value": "87106" }, "firstname": { "value": "Louise" }, "lastmodifieddate": { "value": "1702058170130" }, "lastname": { "value": "Belcher" } }, "form-submissions": [], "identity-profiles": [ { "vid": 801, "saved-at-timestamp": 1667511751622, "deleted-changed-timestamp": 0, "identities": [ { "type": "EMAIL", "value": "louise@bobsburgers.com", "timestamp": 1667511751520, "is-primary": true }, { "type": "LEAD_GUID", "value": "29428db3-e768-4f01-ae49-7e23280db908", "timestamp": 1667511751618 } ] } ], "merge-audits": [], "addedAt": 1702058221138 }, { "vid": 851, "canonical-vid": 851, "merged-vids": [], "portal-id": 22245342, "is-contact": true, "properties": { "zip": { "value": "87106" }, "firstname": { "value": "Linda" }, "lastmodifieddate": { "value": "1702058170130" }, "lastname": { "value": "Belcher" } }, "form-submissions": [], "identity-profiles": [ { "vid": 851, "saved-at-timestamp": 1667511751624, "deleted-changed-timestamp": 0, "identities": [ { "type": "EMAIL", "value": "linda@bobsburgers.com", "timestamp": 1667511751560, "is-primary": true }, { "type": "LEAD_GUID", "value": "bd0d9401-ba87-4f6b-93d5-3b7f0205b032", "timestamp": 1667511751619 } ] } ], "merge-audits": [], "addedAt": 1702058221106 }, { "vid": 901, "canonical-vid": 901, "merged-vids": [], "portal-id": 22245342, "is-contact": true, "properties": { "zip": { "value": "87106" }, "firstname": { "value": "Bob" }, "lastmodifieddate": { "value": "1702058170130" }, "lastname": { "value": "Belcher" } }, "form-submissions": [], "identity-profiles": [ { "vid": 901, "saved-at-timestamp": 1683133205786, "deleted-changed-timestamp": 0, "identities": [ { "type": "EMAIL", "value": "bob@bobsburgers.com", "timestamp": 1667511751550, "is-primary": true }, { "type": "LEAD_GUID", "value": "13ff422f-5c71-47e0-8b29-62247b51233d", "timestamp": 1667511751626 }, { "type": "EMAIL", "value": "bob2@bobsburgers.com", "timestamp": 1683133205772, "is-secondary": true } ] } ], "merge-audits": [], "addedAt": 1702058221087 }, { "vid": 951, "canonical-vid": 951, "merged-vids": [], "portal-id": 22245342, "is-contact": true, "properties": { "zip": { "value": "87106" }, "firstname": { "value": "Gene" }, "lastmodifieddate": { "value": "1702058170130" }, "lastname": { "value": "Belcher" } }, "form-submissions": [], "identity-profiles": [ { "vid": 951, "saved-at-timestamp": 1667511751639, "deleted-changed-timestamp": 0, "identities": [ { "type": "EMAIL", "value": "gene@bobsburgers.com", "timestamp": 1667511751519, "is-primary": true }, { "type": "LEAD_GUID", "value": "4a114578-68f3-482f-86e8-67b3a99fd2b1", "timestamp": 1667511751629 } ] } ], "merge-audits": [], "addedAt": 1702058221113 }, { "vid": 1001, "canonical-vid": 1001, "merged-vids": [], "portal-id": 22245342, "is-contact": true, "properties": { "zip": { "value": "87106" }, "firstname": { "value": "Tina" }, "lastmodifieddate": { "value": "1702058170130" }, "lastname": { "value": "Belcher" } }, "form-submissions": [], "identity-profiles": [ { "vid": 1001, "saved-at-timestamp": 1667511751648, "deleted-changed-timestamp": 0, "identities": [ { "type": "EMAIL", "value": "tina@bobsburgers.com", "timestamp": 1667511751614, "is-primary": true }, { "type": "LEAD_GUID", "value": "781eb0f3-bb93-4e99-8669-5f635e9e1b0f", "timestamp": 1667511751643 } ] } ], "merge-audits": [], "addedAt": 1702058220834 } ], "has-more": false, "vid-offset": 1001 }
I hope this helps get you moving in the right direction.
Have fun building! — Jaycee