Wikipedia:WikiProject U.S. Roads/Maryland/All-time list

Given are the years of the first and last official maps the routes appear on. These are not always the exact years the routes were created or eliminated.

Routes 1-6 and 12-37 were assigned by 1927. It appears that other state roads received numbers (into the 380s?) in about 1929, but only a few of them appear on maps until 1939. A year before 1939 means that the road was state maintained beginning on that year's map (for now I've only gone back to 1928).

The 1939 map may have some routes that were actually created several years later; 683 appears to be the highest number actually existing in 1939. Those that are not on the 1940 map are listed with an asterisk.

Most routes for which the sole source is http://www.mdroads.com/ are listed after the table.

The sole source for the existence of the following routes is the log on http://www.mdroads.com/routes/md.html (completely unknown routes are also listed). This concise listing may help with locating more complete or authoritative information.
 * MD 523: old US 522 north of Hancock, 1966?
 * MD 538: where?
 * MD 634: old 313, Federalsburg, 1956 to 1990
 * MD 643: Halethorpe, 1947 (per bridge)
 * MD 649: old 6 (?), Port Tobacco, 1955?? (per bridge) to 1956; originally Anne Arundel County? per http://www.mdroads.com/routes/mdroutes.txt
 * MD 656: now part of 309, Easton
 * MD 679: Carroll County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 691: old 225, Indian Head, 1954 to probably 1961
 * MD 705: perhaps an old alignment of 376 per http://www.mdroads.com/routes/mdroutes.txt
 * MD 708: Ocean City
 * MD 716: old 202, Landover, 1942 (per bridge), until 1955
 * MD 717: old 36, until 1955
 * MD 719: old US 40, Casselman Creek; new bridge is from 1932, a bit early for the number
 * MD 720: north of Berlin per http://www.mdroads.com/routes/mdroutes.txt, maybe old US 113 or 818?
 * MD 721: C Street, Carney; seems to have served as a ramp from 147 north to 148 east
 * MD 724: Allegany County, until 1955
 * MD 726: old 36, until 1955
 * MD 728: old 36, until 1955
 * MD 729: old 36, until 1955
 * MD 730: old 36, until 1955
 * MD 731: old 36, until 1955
 * MD 732: Allegany County, until 1955
 * MD 734: old US 340 in Sandy Hook
 * MD 736: John Street, Westminster per http://www.mdroads.com/routes/mdroutes.txt
 * MD 737: old US 40 east of Hancock
 * MD 738: west of Wilson
 * MD 739: near Wilson, until 1955
 * MD 739: Allegany County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 740: Westminster, until 1985
 * MD 740: near Wilson, until 1955
 * MD 742: Frederick County, until 1955
 * MD 745: Old US 219, Oakland and Flatwoods in Garrett County, until 1955
 * MD 747: 5 to 693, Charlotte Hall, until 1955
 * MD 748: 5 to 693, Mechanicsville, until 1955
 * MD 749: Solomons Island, disappeared from 1957 to 1963
 * MD 749: related to 49??
 * MD 757: old 165, until 1984
 * MD 758: old US 13 north of Salisbury, 1952 (per bridge) to 1955
 * MD 760: old 24 north of Van Bibber, 1956 per http://www.mdroads.com/routes/mdroutes.txt
 * MD 766: old 650, Silver Spring per http://www.mdroads.com/routes/mdroutes.txt
 * MD 767: where?
 * MD 770: Conley Street, Dundalk
 * MD 771: old 144 east of Ellicott City
 * MD 772: Easton, until 1958
 * MD 773: frontage for 2 south of 100 per http://www.mdroads.com/routes/mdroutes.txt, 1964?
 * MD 774: where?
 * MD 775: old 260, Chesapeake Beach per http://www.mdroads.com/routes/mdroutes.txt, 1960?
 * MD 775: 3 sections of old 55 between Miller and Clarysville, until 1955
 * MD 777: where?
 * MD 780: Old US 40 near Sideling Hill, until 1955 (see Washington County minutes)
 * MD 782: where?
 * MD 789: 135 to 495, Garrett County (see minutes)
 * MD 790: old 468, south of Annapolis, until 1983
 * MD 791, MD 792: where?
 * MD 793: old 424, Davidsonville
 * MD 799: old 32 between Fenby and Eldersburg, until 1956 (see Carroll County minutes)
 * MD 824: old 273?, Oakwood, until 1979
 * MD 829: where?
 * MD 836: old 213, Centreville, 1961? (per bridge) to 1980
 * MD 839: old 139, Towson, 1956? to 1959; Easton per http://www.mdroads.com/routes/mdroutes.txt
 * MD 840: old 33 (?); did this include Old Claiborne Road from 33 north to 451 (e.g. 1961 map)?
 * MD 841: May Port Rd., S. off 579, Talbot Co.
 * MD 842: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 848: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 860: old 235, southeast of Hermanville
 * MD 861: St. Mary's County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 862: St. Mary's County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 865: old 224, Marbury per http://www.mdroads.com/routes/mdroutes.txt
 * MD 866: old 224, Mason Springs per http://www.mdroads.com/routes/mdroutes.txt
 * MD 867: old 228, Waldorf per http://www.mdroads.com/routes/mdroutes.txt, 1993?
 * MD 869: old 6, east of Doncaster
 * MD 875: frontage for US 15, north of Lewistown
 * MD 876: Frederick County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 881: old 68, Williamsport, 1965?
 * MD 882: old 24, Edgewood per http://www.mdroads.com/routes/mdroutes.txt, 1964
 * MD 883: where?
 * MD 884: old 439, Maryland Line per http://www.mdroads.com/routes/mdroutes.txt, 1959
 * MD 885: old 409, Maryland Line per http://www.mdroads.com/routes/mdroutes.txt, 1959?
 * MD 886: Baltimore County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 887: old US 111, Cockeysville
 * MD 888: related to US 1A?
 * MD 892: stubs off MD 7 near bridge over MD 43, White Marsh per http://www.mdroads.com/routes/mdroutes.txt
 * MD 893: Allegany County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 897: related to 650?; Allegheny County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 900: Montgomery County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 902: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 905: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 906: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 907: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 911: Washington County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 916: where?
 * MD 919: where?
 * MD 920: old 416 at Lyons Creek, until 1959
 * MD 922: old 152, Edgewood, 1964 per http://www.mdroads.com/routes/mdroutes.txt
 * MD 923: where?
 * MD 924: I can't match this to what's shown on maps
 * MD 926: where?
 * MD 930: Anne Arundel County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 932: frontage for I-97/3/32, Millersville
 * MD 933, MD 934: where?
 * MD 938: where?
 * MD 941: old 38, Kitzmillerville; Allegheny County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 947: where?
 * MD 955: where?
 * MD 957: old 175, Waterloo, 1969
 * MD 959: Prince George's County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 960, MD 961, MD 962: where?
 * MD 966: Old Ardmore Road, Glenarden, until 1968
 * MD 969: Fort Washington Road, east of 210 to Livingston Road in Prince George's County, until 1968
 * MD 970: Pennsylvania Service Drive north of 4, east from Dower House Road in Prince George's County, until 1968
 * MD 970: frontage for I-70, east of Mt. Airy, 1974??
 * MD 971: MD 714 northwest to dead end near MD 4, until 1981
 * MD 975: Montevideo Road, Waterloo (don't see this as a state road on maps)
 * MD 982: Old Columbia Pike., west of 29, Columbia (from 1992 state planning map)
 * MD 988, MD 989: frontage for 100/607, 1971?
 * MD 989: old US 50, Trappe, 1987 (per bridge) (why wasn't this 954?)
 * MD 994: Anne Arundel County per http://www.mdroads.com/routes/mdroutes.txt
 * MD 997: frontage for I-70, Woodlawn?
 * MD 999: Old Frederick Road, Catonsville?