Hello bsquared, there are other folks here on the forum that can be more variety-specific but I DO know that any crabapple is a good pollinater for any fruiting apple tree.

This place has a pollination chart to the left of the apple description:

http://www.acnursery.com/acn_apple.php?id=macoun

Bsquared:

I grow 30 varieties of apples here, and can hardly notice any difference in bloom period among them. Unless you live in a very isolated area of MA, such as out at the end of Cape Cod, there are surely other apple trees or decorative crabs around that will do the pollination job for you on the Macoun apple. Apples are insect pollinated, and pollen can be carried for hundred of yards to do what is necessary.

If you want to plant another apple, plant the variety that you want. I very much doubt you will face any pollination issues. I have a Macoun here, and what a devil it is to thin. These apples forget to grow a stem, and pack together in the cluster like sardines.

Don Yellman, Great Falls, VA