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If you look at a map of tree types in the U.S. and click on "% Deciduous" or "% Evergreen" you can see how sharp the transition is between types of trees in the U.S. Most people can immediately spot the difference between an east coast city and a west coast city just based upon the surrounding vegetation.
What am I curious about is whether there exists a city in the U.S. that has a roughly equal mix of both types of vegetation? Plenty of deciduous trees but a large number of coniferous trees as well.
It's not "western" vegetation but the upper Great Lakes states typically have a good mixture of both deciduous and coniferous trees. New England and upstate NY as well.
Areas around the I-5 corridor in Washington have a fair number of deciduous trees, like Olympia. (I set the pin down in a random place, this isn't cherry-picked)
A few months ago I was trying to see if I could find a "transition line" between conifers on the west and deciduous trees on the east. This line seemed to lie around Bozeman, MT.
Seattle is pretty mixed. Much of the residential areas around Seattle are deciduous. I rake a lot every fall. I don't know about equal, but there's plenty of fall colors in Seattle, yet in winter it's also green enough.
I would not describe it as "West Coast" vegetation, but Austin is near the dividing line between the humid subtropical gulf coast and semi-arid West Texas, and has a mix vegetation from both neighboring regions. For example, in the tree map posted above it's directly on the line between heavily-deciduous gulf and heavily-evergreen SW Texas.
Allergies are especially bad for this reason: Depending on the season you get large amounts of pollen from both oaks and ashe junipers.
This is the tree distribution, which is basically 50/50 between deciduous and evergreen.
Common name, Population, Leaf area
Ashe juniper 39.3 41.2
Cedar elm 13.5 10.9
Live oak 8.4 13.1
Sugarberry 6.1 7.4
Texas persimmon 6.0 1.2
Green ash 2.2 2.8
Buckley oak 1.2 2.9
Honey mesquite 1.9 1.4
Chinaberry 1.6 1.2
Yaupon 2.5 0.2
Pecan 0.6 2.1
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