No longer assigned (decommissioned 1956, 1970), transferred to Baltimore County maintenance. Associated with MD 600.

Continuing our cluster in Middle River, MD 600 consists of sections of MD 150 bypassed when Eastern Blvd was constructed during World War II. Was still officially Eastern Avenue on signage into the middle 1980s, but everyone called it 'Old Eastern' as long as I can remember. According to SRC data, the mainline section of Old Eastern, the one that was actually usable as a connector, was dropped in 1956, and the other stubs were kept until 1975.

Sections of MD 600: All of these in the same general area of Middle River, except 600C which is just west of the Back River Bridge near Essex.
MD 600: Old Eastern Ave from Marlyn Avenue in Essex to Middle River. Loops south of MD 150. The MD 702 freeway ended here from its completion circa 1970 until extension in 1988.
MD 600A: Eastern Ave 0.16 mi; from MD 601 (Harrison Blvd) east to MD 599 (Baker Ave). Small section in old Middle River just west of the Martin Blvd interchange (MD 150/700).
MD 600B: Eastern Ave from dead end west of Homeland Avenue to dead end east of MD 601. Parallels MD 150 to the north. Dead end at west is due to MD 150 itself, and the east, one of the ramps of the 150-700 interchange.
MD 600C: Eastern Ave 0.10 mi; from MD 150 to road end at Back River. This one is just west of the Back River Bridge near the wastewater treatment plant, behind the Royal Farms gas station.

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No longer assigned (decommissioned 1975).

MD 601 provided straight-on access to MD 150 from the other streets in old Middle River. At the southern end we have Faith Lutheran Church, and at the northern is the old Middle River post office, from the days when proximity to the railroads mattered.

Middle River area routes, showing the 599-600-601 cluster.

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No longer assigned, route now part of MD 198.

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MD 602 near Ft. Meade in 1958.

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Not assigned.

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No longer assigned (decommissioned 1958), transferred to Montgomery County maintenance.

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No longer assigned (decommissioned 1999), transferred to Takoma Park municipal maintenance.

Was not signed even when it was in the state system. Dropped in 1999 with the big cleanup of Montgonery County state routes.

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No longer assigned, now part of MD 304.

Annexed by MD 304 in 1951.

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Marked north-south.

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No longer assigned (decommissioned 1950s).

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No longer assigned (decommissioned), now part of MD 28.

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Marked, no cardinal directions.

This route does not reach south to US 50. As of 1999 it only says "TO 610" at 50's intersection with Whaleyville Rd.

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Marked north-south.

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No longer assigned (decommissioned 1956).

A short route near Harney in extreme northwest Carroll County, this road becomes PA 134 at the state line. It didn't touch any other routes.

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No longer assigned (decommissioned), now part of Route 261.

From a 1948 map, before 261 was brought north of North Beach into Anne Arundel County.

MD 613, from a 1958 General Drafting map. MD 261 took over this route soon after.

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Marked east-west.

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

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Sections of MD 600:
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Unmarked, associated with old sections of MD 313.

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