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

Given are the years of the first and last Delaware or Maryland the routes appear on. These are not always the exact years the routes were created or eliminated. Note that early Delaware maps seem to be missing some routes, hence the Maryland maps are also used.

	from	to	notes
DE 1	1973 ← 14 (part)	now	initially overlapped 14; only independent piece was the Milford Bypass
DE 1A	1974 ← 14A	now	initially overlapped 14A; Milford piece appeared in 1981 as an overlap with 14
DE 1B	1974	now	never appears on state maps, but appears on a 1974 Maryland map
DE 1C	never	never	where?
DE 1D	1996	now?	not in 2012 traffic counts
DE 2	1936	now
DE 3	1968	now
DE 4	1967	now
DE 4	1938	1954 → 299	probably existed in 1936
DE 5	1938 ← 22	now
DE 5A	2001	now?	not in 2012 traffic counts
DE 6	1936	now
DE 7	1936	now
DE 8	1936	now
DE 9	1936	now
DE 9A	1971	now
DE 10	1936	now
DE 10A	1988	now
DE 11	1936	now
DE 12	1936	now
DE 14	1936	now
DE 14A	1942? ← 14 (part)	1974 → 1A	unlabeled until 1966
DE 15	1984	now
DE 16	1936	now
DE 17	1936	now
DE 18	1936	now
DE 20	1936	now
DE 22	1936?	1936? → 5	not on any state maps, but appears on a 1930s county map
DE 23	1994	now
DE 24	1936	now
DE 24A	2006	now?	not in 2012 traffic counts
DE 26	1936	now
DE 28	1936	1973 → US 9 (part)
DE 30	1936?	1936?	not on any state maps, but appears on a 1930s county map
DE 30	1938	now
DE 30A	1999	2012	not in 2012 traffic counts; still on maps until 2017
DE 32	1968	1968 → 54
DE 34	1976	2019
DE 36	1938	now
DE 37	1985	now
DE 41	1936	now	numbered to match PA
DE 42	1936	now
DE 44	1936	now
DE 48	1936	now	numbered to match NJ
DE 52	1936	now	numbered to match PA
DE 54	1969 ← 32	now	numbered to match MD
DE 54A	2006	now?	not in 2012 traffic counts
DE 58	1985	now	why this number?
DE 62	1981	now	why this number?
DE 71	1938	now	numbered to match MD
DE 72	1946	now	why this number?
DE 82	1952	now	numbered to match PA
DE 92	1968	now	why this number?
DE 100	1938	now	numbered to match PA
DE 141	1952	now
DE 202	1981 ← US 202 (part)	now
DE 261	1938	now	numbered to match PA
DE 273	1936	now	numbered to match MD
DE 279	2013 ← 2 (part)	now	numbered to match MD
DE 286	1994	now	numbered to match MD
DE 299	1957 ← 4	now	numbered to match MD
DE 300	1936	now	numbered to match MD
DE 404	1936	now	numbered to match MD
DE 404A	1990	1997 → 404 (part)
DE 491	1936	now	numbered to match PA
DE 796	1936	1936 → 896	numbered to match PA
DE 896	1938 ← 796	now	numbered to match PA
DE 896A	when?	2012	some signage still up?