re: Homeownership Question

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every piece of land in the US is owned by someone or something

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And this info is readily available.

OP, most parishes have an interactive property search map on their website. Click on the property and you'll get all the info you need to contact the owner. Like others have said, take pictures and send a certified letter letting them know there is a hazard. Insurance company will likely have to go after owner if the trees fall and there was documented proof that there was a hazard present.