http://www.cooganresearchgroup.com/v/data/msdeath/index.html

Mississippi Death Certificate Index [1912–1943]
Microfilm (8 rolls)
Locality: Mississippi

The index to Mississippi deaths is arranged chronologically. The first segment 
covers the span of years 1912–1924. The names of the decedents in that span are 
arranged in alphabetical order followed by the county of death, a “w” for white 
or a “c” for colored, the death certificate number, and the last two digits of 
the year of death.

Subsequent annual indexes exist for 1925–1943. They are arranged by the Soundex 
system followed by the surname, forename, middle initial, the numerical code for 
the county of death, the number one for white or the number two for colored, and 
the death certificate number.

The Mississippi county codes are:

Adams = 1
Alcorn = 2
Amite = 3
Attala = 4
Benton = 5
Bolivar = 6
Calhoun = 7
Carroll = 8
Chickasaw = 9
Choctaw = 10
Claiborne = 11
Clarke = 12
Clay = 13
Coahoma = 14
Copiah = 15
Covington = 16
De Soto = 17
Forrest = 18
Franklin = 19
George = 20
Greene = 21
Grenada = 22
Hancock = 23
Harrison = 24
Hinds = 25 
Holmes = 26
Humphreys = 27
Issaquena = 28
Itawamba = 29
Jackson = 30
Jasper = 31
Jefferson = 32
Jeff_Davis = 33
Jones = 34
Kemper = 35
Lafayette = 36
Lamar = 37
Lauderdale = 38
Lawrence = 39
Leake = 40
Lee = 41
Leflore = 42
Lincoln = 43
Lowndes = 44
Madison = 45
Marion = 46
Marshall = 47
Monroe = 48
Montgomery = 49
Neshoba = 50
Newton = 51
Noxubee = 52
Oktibbeha = 53
Panola = 54
Pearl River = 55
Perry = 56
Pike = 57
Pontotoc = 58
Prentiss = 59
Quitman = 60
Rankin = 61
Scott = 62
Sharkey = 63
Simpson = 64
Smith = 65
Stone = 66
Sunflower = 67
Tallahatchie = 68
Tate = 69
Tippah = 70
Tishomongo = 71
Tunica = 72
Union = 73
Walthall = 74
Warren = 75
Washington = 76
Wayne = 77
Webster = 78
Wilkinson = 79
Winston = 80
Yalobusha = 81
Yazoo = 82