Maine does not have many deer..
 

At least up our areas we do not have many and they are very hard to hunt.. But, what we do have is some really nice monsters in the line of whitetails.. This buck was shot last year up here and is quite impressive by all standards.. Someone will have another big buck like these yet as quite a few gets tagged during our season and this year is looking like one of the best seasons in quite a few years.. Not much in line of corn or soybean fields in the woods up here.. http://www.outdoorlife.com/blogs/big...edHCU66XjOG.01

The one above was shot last year.. Here is a 19 pointer taken this year with a dressed weight of 254 lbs.. Taken this year..
http://www.huntingnet.com/forum/memb...19-pointer.jpg

This 11 pointer with a dress weight of 204 lbs.. Taken this year

Not to be left out is this rare doe with 8 points.. Taken this year..


http://bangordailynews.com/2014/11/0...e-8-point-doe/

The farther north in latitude you go, the larger the bodies on whitetails. Couple that with not only big woods, but very big woods that makes it hard to hunt and you wind up with older very big deer.

Our winters kill a lot of deer off with our predators.. Mainly the coyote is what keeps the population down during the winter months.. then during the spring it is bears and coyotes killing a lot of fawns off. That is not to mention bobcats and Canadian lynx getting a few either..
Also most northern states have a breed of white tails that grows larger than most southern states have along with the beechnuts and oak builds mass to help get them threw those long winter months.. We also have some smaller deer as well. That mostly is a southern part of the state where it is more populated..

AKA, Bergmann's rule
http://www.thefreedictionary.com/Bergmann's+rule

At least you have trophy size deer. The rest of the east coast has freezer grade deer.

Whups, sorry for deleting that under y'all. I thought I'd gotten it quickly enough. I decided it was kind of a dumb question, but thanks for answering anyway.

I'm guessing that having fewer competitors for food and shelter also encourages larger animals?

No, latitude causes larger animals.