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This somewhat depends on how you intend to contact those on your database.
For example, if you have a good home address, or a good business address or a good email address, then at least 80% of the time you would want to have at least one of these.
85% or higher for addresses is typically the norm for institutions with a good tracing and updating program. Phone numbers change more often so the average for phone numbers may be from 60% to 80%. Email addresses 46% to 60%.
Other standards that should be measured are the number of entities on the database with a current employment record, number with board memberships.
These statistics will typically vary depending on a number of factors:
More important than absolute percentages
looked at in a snapshot fashion, are tracking the trends and ensuring that
the trends remain favorable. For example, if your addressable rate was 80%
last year, has it improved? Monitoring these trends will help you to spot
inconsistencies and improve your contactable rate over time.