No longer assigned (decommissioned 1950s).

Once only consisted of a small stub near Taneytown. By 1955 it consisted of the entire distance to MD 84. Presumed decommissioned circa 1956.

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No longer assigned (decommissioned 1970s).

East of American Corner, this was part of MD 313, later shifted eastward. MD 621 was still on the maps into the seventies. In the early 2000s, the former route was renamed Auction Road, apparantly named after an auction house along the road just east of American Corner. I'll leave the old name above for now, since it was never Auction Road and MD 621 at the same time. Forming the other crossroads of American Corner are two other former routes. MD 621 was the east-west; to the north was MD 630, and to the south was MD 617. The eastern part of MD 621 and MD 630 were once part of MD 313.

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No longer assigned (decommissioned 1950s).

This mysterious L-shaped route ran south of MD 31 (now the 'old' 31, or 852), then east to MD 27. In 1948, there were two non-contiguous sections, a small stub south of MD 31 and the other going east from the intersection of Chapel and Stone Chapel east toward, but not touching, MD 27. Everything in this area has been widened, in likely anticipation of development.

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Marked north-south.

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Marked north-south.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked east-west.

When I first saw 627 and the town of Oriole on a map, I thought it had to be some kind of 'copyright trap' put in by a mapmaker. But they are really there, and 627 has been around at least since 1940.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Unmarked.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Sections of MD 620:
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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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No longer assigned (decommissioned).

Oakington, at the southern end of this route, was a farm belonging to former U.S. Senator Millard Tydings, for whom the nearby I-95 Susquehanna River Bridge is named.

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Unmarked. Only signage is "TO US 220" and "TO MD 53"

NHS: Possibly, since it's the only connection from one NHS section to another.

Seems minor, but it's the only access between MD 53 and northbound US 220. MD 53 south of this is one way southbound.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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Marked Unmarked No longer assigned (decommissioned). north-south. east-west.

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