Marked east-west.

NHS: East of I-95 into Aberdeen Proving Ground.

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Marked north-south west of MD 165, east-west between 165 and US 1.

A new MD 23 was built in the sixties from US 1 west to MD 165, 2-lane and partial limited access. There's a break in the route along 165 between the old and new 23; it's not dual-signed with 165, only "TO MD 23".

Route 23 has been extended on its east end to connect with the new Hickory Bypass (US 1).

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Sections of MD 23:
MD 23A: 0.34 mi.; East-West Hwy. ramp onto Bel Air Bypass. Actually part of southbound US 1.

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Marked north-south.

NHS: Between I-95 and US 1.

The main commuting route for the rapidly developed suburban corridor between I-95 and Bel Air, MD 24 was rebuilt on new alignment in the late eighties. The 4-6 lane divided highway with access controls replaces the old 2 lane version, now MD 924. It then runs concurrently with US 1 (Bel Air Bypass) to 924 north of town. From there it's two lanes all the way to the Pennsylvania border town of Fawn Grove, becoming a small spur (one of those 4-digit PA numbers) off PA 851. Somewhat confusing since MD 23 turns into PA 24 on the other side.

Development has engulfed the entire length of Route 24 south of Bel Air, but access controls on 24 itself seem to be working to keep traffic moving for the most part. It's a little more hairy in Bel Air proper near Harford Mall with 3-4 traffic lights in quick succession. New development now extends along 24 beyond the bypass. This stretch is a 3-lane road with center turn lane. From the intersection with 23 north to the Pennsylvania line, Route 24 becomes a two-lane road, and a curvy one at that, especially through Rocks State Park. (speed limit is 25 mph through the park)

Associated Secret-Obscure Routes:
408 755 924

Sections of MD 24:
MD 24D: 0.23 mi.; Enhances access between 24 and US 40, where before only access was via MD 755.

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Marked north-south.

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Associated Secret-Obscure Routes:
746

Sections of MD 25:
MD 25A: 0.58 mi.; Jones Falls Expwy. north from I-83-695 interchange to Joppa Rd. This is the 'stub' north of I-83 on maps, and is signed as I-83.

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Marked east-west.

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Associated Secret-Obscure Routes:
633 850

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Marked north-south.

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Associated Secret-Obscure Routes:
808 849 852

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Marked east-west.

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Associated Secret-Obscure Routes:
609 899 911 928

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Marked north-south.

US 29 has its own page in the US highway section.

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Not assigned, became MD 27 in 1934.

MD 29 swapped numbers with 27 when the latter became the new US 29 in 1934.

1934, the year of two 29s. MD 29 (left) changes to 27 the following year, as US 29 bottom right, enters Maryland along the former MD 27.

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Marked north-south.

NHS: Entire length except between I-795 & MD 140.

Associated Secret-Obscure Routes:
668

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Marked east-west.

Route 31 once ran west of its current end in Libertytown all the way to Frederick before it was switched to MD 26. On the other end MD 27 northeast of Westminster, along with a small piece to the northeast of Manchester was once part of 31.

Associated Secret-Obscure Routes:
852

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Marked north-south from Westminster to MD 108, east-west south of MD 108 to I-97.

NHS: Between I-97 and I-70.

Now a freeway for a significant part of its length, MD 32 has seen more than its share of changes over the years. Route 32 began as a highway northwest off US 140 in Westminster west to Taneytown and Emmitsburg. To the south, 32 was extended south down to current MD 144, later all the way south to US 1, over a southern section once designated MD 106. All this before World War II. The original section was bypassed by MD 97 in the sixties, later MD 140. The northern terminus of 32 was rolled back to Westminster, and the old section numbered MD 832. The Patuxent Freeway was completed from US 1 south to MD 170 by the late eighties, and north of US 1 to US 29 upgraded in stages in the early 1990s. The full freeway north to MD 108 in Clarksville was finished by 1996, with the exception of traffic lights near NSA just east of the B-W Parkway. These lights, the last on MD 32, were all removed by 2004. There is also a change of exit numbers and configuration of the junctions in this area. (Thanks to David Grabiner for these updates)

Associated Secret-Obscure Routes:
432 732 832 851 904 932 (look at all those x32s)

Sections of MD 32: AA-AK are all in the Odenton area.
MD 32A: (no name) (CR) 0.16 mi.; from MD 32 west to MD 851.
MD 32B: (no name) (HO) 0.02 mi.; between MD 32 and MD 851H.
MD 32AA: Sappington Station Rd. (AA) 1.00 mi.; from MD 32 north to MD 677.
MD 32AB: Burns Crossing Rd. (AA) 0.13 mi.; from MD 32AA north to Dicus Mill Rd.
MD 32AC: Burns Crossing Rd. (AA) 0.40 mi.; from MD 32AA south to end of state maintenance.
MD 32AD: Sappington Dr. (AA) 0.06 mi.; small section under SHA maint.
MD 32AE: Dicus Mill Rd. (AA) 0.15 mi.; from MD 32AB east to end of state maintenance.
MD 32AF: Gambrills Rd. (AA) 0.32 mi.; connects 32AI, AH, and AJ.
MD 32AG: Tobin Way (AA) 0.16 mi.; from MD 32AF west to cul-de-sac.
MD 32AH: Lodigani Ave. (AA) 0.4 mi.; from MD 32AF east to road end.
MD 32AI: (no name) (AA) 0.04 mi.; from MD 32AF east to road end.
MD 32AJ: Jackson Grove Rd. (AA) 0.27 mi.; from MD 170 west to end of state maintenance.
MD 32AK: Redmiles La. (AA) 0.34 mi.; from Old Mill Rd. south to road end.

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Marked east-west.

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No longer assigned, became MD 17 in the 1930s.

Don't know why 17 and 33 were swapped, other than perhaps a proposal to extend US 17 north of adjacent Virginia, but still unsure. US 33 runs east-west a ways down in Virginia, too.

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Marked east-west.

Associated Secret-Obscure Routes:
845

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Suffixed section of MD 34:
MD 34A: North Main St. 0.12 mi.; connector at north end of Keedysville.

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Marked north-south.

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Marked north-south.

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Associated Secret-Obscure Routes:
654 655 657 692 717 726 728 729 730 731 831 935 936 937 939

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No longer assigned (decommissioned 1999).

On some maps since the fifties. Didn't touch any other route, except the bridge over I-795. Most strange.

MD 37 marker at beginning of route, eastern terminus near Owings Mills, 1998.

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No longer assigned, entire route now part of US 219.

In the thirties, US 219 ended at US 40 in Grantsville. Circa 1939 it was decided to extend 219 south through Garrett Co. into West Virginia. Soon thereafter 37 was reassigned to the short piece of McDonough Rd above.

Route 37 marked the end of the east to west statewide 12-37 numbering cluster. MD 38, 39, and (41) were assigned to local routes in Garrett County., beginning the second tier of routes ending at 380 on the lower Eastern Shore.

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Marked north-south.

Once went further west along 135 then north on Sand Flat Rd. to US 219. Begins Garrett County 38-42 primary numbering cluster.

Sections of MD 38: both connect 38 and 135.
MD 38A: (no name) 0.0 mi.; east of 38.
MD 38B: (no name) 0.0 mi.; west of 38.

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Marked east-west.

The westernmost Maryland state route, reaching west longitude 79° 29' at the West Virginia border.

Associated Secret-Obscure Routes:
827

Section of MD 39:
MD 39A: (no name)0.01 mi.; north off MD 39 to MD 827C.

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