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430 · 431 · 432 · 433 · 434 · 435 · 436 · 437 · 438 · 439 

MD 420

Montgomery
Laytonsville
MD 420 · was Brink Rd
from MD 124 west to Goshen Rd

No longer assigned (decommissioned).

Likely decommissioned with the sweep of routes in the mid fifties. There aren't any old MD 420 signs around anymore to provide decoration for innumerable college dorm rooms. Were this route still on the books, sign replacement may have become an issue, as it did with NJ 69 (changed to NJ 31).

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MD 421

Montgomery
Travilah
MD 421 · was Travilah Rd
from MD 190 northeast to end of state mainteance at Glen Rd.

No longer assigned (decommissioned)

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MD 421, 1958 MD 421, from a 1958 General Drafting map.

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MD 422

Anne Arundel
Bayard
Mt. Zion
(Lothian)
MD 422 · Bayard Rd
3.04 mi.; from end of state mainteance east to MD 2/MD 408.

Marked east-west.

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422
0.0 Begin
3.0 MD 2
3.0 MD 408

MD 423

Anne Arundel
Fairhaven
MD 423 · Fairhaven Rd
2.79 mi.; from MD 2 east to end of state maintenance at Arundel Rd.

Marked east-west.

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423
0.0 MD 2
2.8 ESM

MD 424

Anne Arundel
Conaways
Crofton
Davidsonville
MD 424 · Davidsonville Rd
8.24 mi.; from MD 3 southeast to MD 214.

Marked north-south.

Associated Secret-Obscure Routes:
909 793

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424
8.2 MD 3
5.6 MD 450
3.3 US 50/301 16
2.5 MD 909
0.0 MD 214

MD 425

Charles
Mason Springs
Pisgah
Ironsides
MD 425 · Mason Springs Rd, Ironsides Rd
11.77 mi.; from MD 6 north to Md 224.

Marked north-south.

Once only extended south to the junction of MD 6 at Ironsides. A small piece near the southern MD 6 junction near Nanjemoy was MD 491.

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425
11.7 MD 224
  4.8 MD 6
  0.0 MD 6

MD 426

Charles
Nanjemoy
MD 426 · was Liverpool Point Rd
from MD 224 east to MD 6.

No longer assigned (decommissioned).

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MD 427

Charles
MD 427 · was Chapel Point Rd
from US 301 west to end of state manintance at entrance to Chapel Point State Park.

No longer assigned (decommissioned).

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MD 428

Charles
Dentsville
Newport
MD 428 · was Penns Hill Rd
from MD 6 south to MD 234.

No longer assigned (decommissioned).

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MD 429

Charles
Faulkner
Popes Creek
MD 429 · was Popes Creek Rd
from US 301 southwest to road end.

No longer assigned (decommissioned).

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MD 430

Prince George's
College Park
MD 430 · Greenbelt Rd
0.49 mi.; from US 1 east to MD 193.

Unmarked.

Once extended east to MD 201, but now all that remains is this small section, a connector in the US 1/MD 193 interchange, too short to be marked separately.

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MD 431

St. Mary's
Drayden
MD 431 · was Cherryfield Rd
south off Drayden Rd (former MD 244) to road end.

No longer assigned (decommissioned).

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MD 432

Howard
Columbia
MD 432 · Glen Oak La
0.25 mi.; from Guilford Rd (old MD 32/732) west to cul-de-sac.

Unmarked.

MD 432 remains on the books, although the connecting part of Guilford Rd has lost its status as MD 732.

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MD 432

Montgomery
Clarksburg
MD 432 · was Kingsley Rd, Hawkes Rd
between MD 121 and MD 27.

No longer assigned (decommissioned).

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MD 433

Caroline
Smithville
Federalsburg
MD 433 · was Smithville Rd
from old MD 313 north of Federalsburg northeast to end of route near Smithville.

No longer assigned (decommissioned).

Appeared between 1949 and 1953, and dropped not long after.

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MD 433

Prince George's
Beltsville
MD 433 · was Pringe George's Ave

No longer assigned (decommissioned).

Appears on a 1940 state map, gone by 1946.

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MD 434

Pringe George's
College Park
Berwyn
Berwyn Heights
MD 434 · was Pontiac St, 57th Ave, Berwyn Rd
from US 1 east to Edmonston Ave service road (old MD 201).

No longer assigned (decommissioned).

Just a bunch of neighborhood streets now. The function of this route was largely replaced by MD 193, and MD 201 just past the eastern end is now 6-8 lanes wide.

More info comes from Frank McConnell about Pontiac Street:
I lived on Pontiac Street in the 1960s-1980s. Yes, it used to be part of MD 434, and it's not any more, but it's not gone. The state repaved it, put in curbs and sidewalks (at least on the Pontiac Street portion, not sure about 57th Avenue or Berwyn Road) and gave it to Berwyn Heights to maintain. Berwyn Heights did what it is good at: it erected stop signs. So I suppose you could say it's all still there, they just changed the ownership and signs. Oh, and got rid of the lane markings.

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MD 435

Anne Arundel
Annapolis
MD 435 · Taylor Ave, Annapolis St
1.16 mi.; from MD 450 (West St) northeast to MD 450.

Marked north-south.

State maintenance begins 0.3 miles north of West St (MD 450), roughly at the spot of an old rail crossing. Turns eastward onto Annapolis St for the last 0.2 miles to MD 450 at the edge of the Naval Academy campus. According to the 1953 state map, 435 once turned left at this point, going northwest on Annapolis St, then turning right, northeast on Severn Avenue to its end. The part of Annapolis St that is part of 435 now was MD 436, and current 436 (Ridgely Ave) was MD 438, named Revell St south of the drawbridge. The small part of Severn Ave between Annapolis St & Ridgely Ave would have been MD 437.

The group of 435-438 are all in or near the neighborhood of West Annapolis. It's more north than west looking on a map, lying northeast of MD 70 (Rowe Blvd) and northwest of MD 435.

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435
1.2 MD 450
1.0 Annapolis St
0.9 MD 436
0.8 MD 70
0.3 BSM
0.0 MD 450
0.0 MD 387

MD 436

Anne Arundel
Annapolis
MD 436 · Ridgely Ave
1.14 mi.; from MD 436 (Taylor Ave) northwest to end of state maintenance at Bestgate Rd.

Marked north-south.

Associated Secret-Obscure Routes:
783 784 785 786

Was once numbered MD 438 at some point, and was probably named Revell St. MD 436 features a swing type drawbridge of Weems Creek. Runs just east of the parallel MD 70 (Rowe Blvd). The secret/obscure routes are clustered up near 436's overpass of US 50.

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436
1.1 Bestgate Rd
1.0 MD 784
0.7 MD 783
0.5 Drawbridge
0.2 Melvin Ave
0.0 MD 435

MD 438

Anne Arundel
Annapolis
MD 436 · was Annapolis St
old number for current MD 435 between Taylor Ave and MD 450

No longer assigned (decommissioned), entire route now part of MD 435.

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MD 437

Anne Arundel
Annapolis
MD 437 · was Severn Ave
from Ridgely Ave northeast to Annapolis St.

No longer assigned (decommissioned).

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MD 438

Anne Arundel
Annapolis
MD 438 · was Ridgely Ave
old number for current MD 436

No longer assigned (decommissioned), entire route now MD 436.

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MD 439

Baltimore
Maryland Line
Shane

Harford
Shawsville
MD 439 · Old York Rd
7.19 mi.; from MD 45 southeast to MD 23.

Marked east-west.

Associated Secret-Obscure Routes:
885

MD 439 is only the northernmost part of the 'Old York Road', which carries all or part of three routes. From the southern end of 439, it goes south on current MD 23 for a while before diverting southwest, hitting MD 562 south of Monkton, carrying that number for a short distance before the end of SHA maintenance. It disappears south of MD 145, but once linked with current MD 146 (Jarrettsville Pike/Dulaney Valley Rd) merging again with York Road at the modern-day Towson Circle. There is also a section of Old York Rd inside Baltimore City limits.

MD 439 was a broken route, with a piece up near the northwestern end, from York Road east to an indeterminate point west of Lentz Road, resuming at the Harford/Baltimore County line to MD 23. In 1979, the intervening stretch of unnumbered road was brought into state maintenance.

Old York Rd Baltimore County from early 1950s map, with Old York Rd highlighted in yellow. MD 439 is at top. York Rd at the time was still US 111. The first piece of the pre-Interstate Harrisburg Expressway also appears.

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439
0.0 MD 45
0.2 I-83 36
6.0 BA-HA Line
7.2 MD 23