Top Definition
A high-ride all througout harford county maryland. Consists of the towns of Aberdeen, Bel Air, and a part of Fallston.
"Hey man i just got back from the HarCo 500."

"Oh so your really fucking high right now?"

"Yes"
by HarCo 500 man April 03, 2009
5 Words related to HarCo 500

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