Maryland 

State Initial 

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The 1963 United States Postal Service postal abbreviation overhaul was a massive nationwide modernization effort designed to streamline mail processing for a rapidly growing population. Driven by the introduction of the five-digit ZIP code system on July 1, 1963, the post office faced a major technical challenge: early computerized sorting machines and address printing equipment could only fit a maximum of 23 characters on the bottom line of an envelope [USPS]. To prevent city names, state names, and the new five-digit codes from spilling over, the USPS officially cut traditional abbreviations (like "Md." for Maryland or "Mass." for Massachusetts) down to a mandatory, uniform system of two capitalized letters in October 1963 [USPS]. This swift administrative transition permanently optimized the nation's addressing standards, allowing early optical scanners to read mail rapidly and laying the groundwork for the fully automated sorting infrastructure used across the country today.

The post office gave us the abbreviation MD, which is perfect because after sitting in a three-mile gridlock traffic jam trying to cross the Thomas Johnson Bridge, you will absolutely need a medical doctor to fix your blood pressure.