What type of mice are most common in Massachusetts?

The mice I find here are very small with gray-brown fur and have ((what I can best describe as)) an elongated pear-shape body. I'd say they're about one and a half inches long excluding the tail. ((They're really cute, actually))





I don't have a picture of the mice, but since I use humane live traps in my house I always see them before I release them into a field. If anyone has any ideas as to what type of mouse this is, I'd appreciate it.What type of mice are most common in Massachusetts?
Do they have white bellies? Without a picture, my first guess would be either deer mice or white-footed mice. They are very similar in appearance and closely related. The best way to tell them apart is that deer mice generally have a sharply contrasted bicolored tail (white on the bottom, gray or brown on top), and the colors on the tails of white-footed mice do not contrast near as much.





Deer mouse pics:


http://share3.esd105.wednet.edu/rsandeli鈥?/a>


http://www.animalpicturesarchive.com/vie鈥?/a>





White-footed mouse pics:


http://animaldiversity.ummz.umich.edu/si鈥?/a>


http://animaldiversity.ummz.umich.edu/si鈥?/a>





Another possibility is the house mouse, which doesn't have a white belly.





House mouse pics:


http://www.doyourownpestcontrol.com/hous鈥?/a>


http://www.naturephoto-cz.com/photos/and鈥?/a>





There are also jumping mice in Massachusetts (http://www.hubbardbrook.org/image_librar鈥?/a> ) which have really big back feet and a more blunted face than the murids. The jumping mice are probably not as common as the others.