You don't want a tree to overwhelm your yard, buckle the sidewalk or interfere with utility lines. The diagram and descriptions below give an idea what size trees are appropriate in each zone of your yard.

Parking strip under power lines Zone 1
Near the parking strip; stick with small trees (20-35 feet). They are generally compatible with overhead power lines. Also consider the shape or spread of the tree; a species with a spreading crown is better suited to a wider parking strip. See our handy guide to selecting street-smart trees.
Front/side yard Zone 2
Small to medium sized trees are appropriate here, depending on the size of your front/side yards. Medium sized trees (35-50 feet), require large private lawn areas. Plant trees with spreading crowns at least 25 feet away from wires, sidewalks and buildings; plant trees with columnar or pyramidal forms at least 10 feet away.
Back yard Zone 3
In the backyard, any size tree is okay depending on the size of your yard. Large trees (50+ feet) require a large yard. Remember, trees with spreading crowns should be at least 25 feet away from wires, sidewalks and buildings; trees with columnar or pyramidal forms should be at least 10 feet away.
More information
For more information on tree planting and selection, see these links: