“Once a Long Islander, always a Long Islander,” even when you’ve moved to the other side of the country, West Islip native Lisa Socha says.

The motto has an even stronger meaning now, after Socha, now a Washington state resident, received some encouraging words from an anonymous Long Island native last weekend.

About a year ago, Socha, 49, moved to Renton, Washington — outside of Seattle — but she still suffers from bouts of homesickness.

Last Saturday, after a long shift at her job as a hairdresser, Socha was walking to her truck when she spotted something pinned to its front window. It was a simple note, wrapped in plastic to protect it from the rain, from someone else who had wandered far from the East Coast to another.

It read: “Hey fellow Long Islander, I’m from Port Jefferson. Just wanted to say hi and I like your bumper stickers. P.S. I miss the pizza.”

Socha’s truck is “easily recognizable to anyone from the Island,” she said. It has a Smithtown license-plate frame, a worn West Islip High School sticker and is covered in Mets paraphernalia.

Socha, who posted the note on Facebook, said she is hoping to get in touch with the letter writer, who she imagines as a kindred spirit searching in vain for a Seattle slice that may rival the pizza here on Long Island.

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But the note was left unsigned.

“I miss my home. I’ve been really very homesick,” she said. “But this got me smiling.”