Would "the 411" have been marked as Black slang in the '90s?
On the Sci-Fi/Fantasy site, a user asked what "What's the meaning of '411 on the late-night drop box'?," a line from Captain Marvel, which was set in 1995.
Another user answered that it meant "how to use the video return slot" (correctly, IMO), but made an off-hand comment that "the 411" was considered Black slang. They certainly seem to be correct that it originated from Black culture, namely Aretha Franklin's 1982 song Jump to It.
However, many commenters remarked they didn't think it was specifically associated with Black American English, a sentiment I would have shared. Even Urban Dictionary, a site which ... doesn't really shy away from slapping racial labels on things doesn't mention anything about being associated with Black Americans.
Neither does our question/answer on it, in fact the top/accepted answer links it to Valley Girl subcultures, which, while very '90s, is definitely not Black.
So, the question is, would "the 411" have been marked as Black slang in the '90s? Or even in '82?
The slang expression "411" was familiar enough as black U.S. slang to be included in Geneva Smitherman, Black Talk: Words and Phrases from the Hood to the Amen Corner (1994):
FOE-ONE-ONE (4-1-1)
The facts, the information on something, the DEAL. From the telephone number 4 1 1, used to get local directory assistance from the telephone company (a number now in the process of transition). A 1960s term resurfacing in HIP HOP, as in Mary J. Blige's 1992 album and title song What's the 4 1 1? First used in African American music by Aretha Franklin: "No, Kitty, you know when we talk, we have a lot of fun, don't we, girl? Dishing out the dirt on everybody and and giving each other the 4 1 1 on who drop kicked who this week" (from "Jump to It," the title JAM on her 1982 album, written and produced by Luther Vandross).
Smitherman asserts that "the 411" was "a term" (implicitly, a black slang term) in the 1960s but then fell into general disuse—notwithstanding a mention of it in an Aretha Franklin/Luther Vandross song—perhaps until repopularized by Mary J. Blige in 1992. On that record, the argument for its being strongly associated with black slang in the early 1990s seems quite strong; but Smitherman doesn't point to any record of the term's use as slang before Franklin in 1982, and I was unable to find any print record of it from the 1960s in searches of newspaper databases or Google Books. Another fairly reliable reference work for black slang, Clarence Major, Juba to Jive: A Dictionary of African-American Slang (1994) has no entry for "411" or "four-one-one."
According to a Wikipedia article on 4-1-1, wide-scale use of the 411 directory assistance number in the U.S. and Canada began in 1962, so the window for converting it into a slang term during the 1960s was only about eight years wide.