Ask the police department as the definition may be different in your area than ours.
Door hangers are a nice option to flyers or other paper leave behinds that may otherwise blow away. Door hangers are stable. Solicitation in our part is the personal contact. Door hangers are labor intensive to distribute - in expensive to print. (
www.jakprints.com). Post cards cost a little more to do saturated mailings by carrier route - and may not provide the same impact since 'junk mail' gets tossed quicker. People open their mail over the trash can. The door hanger gives you a few moments longer to make an impression before it hits the trash can.
We had a graphic designer layout our door hanger using a common back side with different themes on the front for the season and message. Four color on both sides 4.25" x 11" with die cut - about $0.105 each for 5000 or 7500 quantity.