Who Qualifies for Nonprofit Prices?
Organizations that typically are eligible for Postal Service nonprofit privileges include:

Agricultural 
Educational
Fraternal
Labor
Philanthropic
Religious
Scientific
Veterans
Some political committees
Individuals are NOT eligible for nonprofit prices; also, not every organization is eligible, even though you may think it qualifies based on the list above. For example, business leagues, chambers of commerce, social and hobby clubs, and certain political organizations usually are NOT eligible.

Your organization must apply for and receive nonprofit authorization prior to mailing at nonprofit postage rates.You do not need to purchase a mailing permit if you are using a mailhouse. You can use their permit as a ghost permit and mail at nonprofit mailing rates.

There are restrictions as to what may be mailed at those prices. For instance, there are restrictions on the amount and kind of advertising you can do. It's always best to check with your local Business Mail Entry Unit staff before you design and print your mailpiece.

In addition to your local Business Mail Entry Unit, Publication 417, Nonprofit USPS Marketing Mail Eligibility provides complete information about nonprofit eligibility, including the types of materials that may be mailed at the Nonprofit prices and instructions for applying for nonprofit mailing privileges