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Learn more about public domain photos HERE (http://www.publicdomainsherpa.com/copyright-public-domain.html)

5000 Free Public Domain Stock Photos
http://www.public-domain-photos.com/
All photos on this web site are public domain. You may use these images for any purpose, including commercial. But if some photo contains logos and products you need to be careful. Using someone else's trademark commercially can get you sued.

PD Photo - Free Photos And Pictures (public domain)
http://pdphoto.org/
PDPhoto.org is a repository for free public domain photos. Most of these photos are free to use for any purpose.
Public Domain Images
Public domain images - pictures, royalty free stock photos. Free public domain images for personal and commercial use.

ImageBase
http://imagebase.davidniblack.com/main.php
You can use the images for whatever you want, personal, commercial or non-profit use for free

Pixabay - Public Domain Images
http://pixabay.com/
Find quality public domain photos without any limitation or upload images yourself and contribute to a better world.

Public Domain Photo