These Post Offices have a connection to the Irish-celebrating holiday

'...what better way to set a St. Patrick’s Day greeting card apart than with an Irish-themed postmark?

There are several to choose from, including St. Patrick, MO; Limerick, ME; Clover in South Carolina and Virginia; Erin in New York and Tennessee; Green in Kansas and Ohio; Ireland in Indiana and West Virginia; and Shamrock in Oklahoma and Texas. ...'

Reference: news.usps.com
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