Best practice for updating lead records

[Anonymous]

I was given a spreadsheet of about 1000 leads and contacts. I need to update values such as postal code and was wondering how to best accomplish this. I typically upload leads from an industry event/trade show to the corresponding program in which the leads were obtained from.

[Josh_Hill13]

Do you mean that the sheet has the new zip codes to update existing leads in Marketo?

You can just import the list as a Static List in Lead Database if these leads aren't members of a program per se.

Import a List of Leads - Marketo Docs - Product Docs '

I would just keep the columns to Email Address | Postal Code

unless you also want to update other fields.