[fieldmarshaldj]

I don’t know where to find the racial demographics for legislative districts. I can only answer the racial breakdown in the Dem caucus:

Out of the 20 Dem State Senators, 12 are Black and 8 are White.

Out of the 57 Dem State Representatives, 37 are Black and 20 are White.

[AuH2ORepublican]

Looking at the MS state senate members and the counties represented, and using common sense to estimate which parts of each county they represent, I am certain that every black Democrats in the MS state senate represents a black-majority district (and with blacks being super-majorities of Democrat primary voters). As for white Democrat state senators, I suspect that the one white Dem in Jackson represents a black-majority district (many white parts of Hinds County are in a GOP district that is partially in Madison County), and a white Dem in Panola County must represent a district whose black percentage is in the high 40s; and in addition to those two, there are probably one or two others representing districts in which blacks are the majority of Democrat primary voters.

I haven't looked at the MS state house, but I suspect that I would find the same phenomenon were I to do so (which I won't).