One of the ways you can make your mailing list more targeted and therefore more accurate is to really analyse your best customers and create a profile for them.
An example of a simple customer profile for a child daycare center maybe:
- Households in a 5 mile radius of your location.
- Families with children ages 0-6.
- Households with an income of 75K +.
With this information you can build a mailing list targeting only those families who are most likely to use your childcare services.
A nice customer profile form from American Express.